1. Pee in the same toilet cubicle on a night out. Flo Perry / BuzzFeed Sometimes the gossip is too good to pause while one of you does a wee. 2. But also pee in the same room when you're at each other's houses. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF HBO If you're getting ready for a night out in the bathroom and one of you suddenly needs the loo, there's no point in the other one going outside. 3. Borrow each other's tights, pants, and socks without a moment's hesitation. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF E! You're basically the same person, so you see nothing wrong with sharing personal items. 4. But also borrow each other's toiletries without batting an eyelid. Remee Patel / BuzzFeed / Getty Images You also don't have a problem sharing deodorant or razors. 5. Boast about how hairy your legs have got. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF NBC There's nothing wrong with making your BFF feel how prickly your legs have become. 6. Fail to engage in actual conversation because one of you needs to rant about something. Hallie Cantor @halliecantor does it count as friendship if instead of both of us taking turns talking about our lives, i just scream for a while & you listen 02:02 AM - 30 Dec 2015 Reply Retweet Favorite A true friend will tolerate you ranting for 45 minutes without asking how they are. 7. Lie beside each other, on the floor, with your trouser zip undone because you've eaten so much food. FOX There's absolutely nothing wrong with eating until the point of sickness. 8. Keep each other company while the other one gets changed. View this photo on Instagram instagram.com It's nice to chat and get ready at the same time. 9. Compose romantic, and sometimes even sexy, texts on behalf of each other. View this post on A true friend will help you articulate exactly how you felt about last night. 10. Check each other's job applications, tax returns, and armpits without even a moment's hesitation. Flo Perry / BuzzFeed If your friend needs you, you're there. 11. Apply fake tan, sun cream, and aftersun to each other's rude bits. Twitter: @Hannahh_Robb You've seen it all before, so it's no big deal. 12. Text each other your most inane medical symptoms and expect a detailed medical diagnosis in return. Twitter: @chungswag Being a makeshift trained medical expert is a vital part of being a best friend. 13. Rank people you know out of 10, based on hotness. Walt Disney Pictures Seems mean, is quite fun. 14. Rank people you know out of 10, based on personality. instagram.com Seems even meaner, is even more fun. 15. Text each other when your period starts for no reason other than getting a bit of sympathy. Kat Angus / BuzzFeed It's extra fun if you both get your period on the same day. 16. Text each other when someone upsets you and expect to receive a list of their bad qualities in return. Jen Doll @thisisjendoll Liking the same stuff is one thing. But hating the same things? True friendship. 07:13 PM - 14 Jan 2016 Reply Retweet Favorite You: "Kate has been really mean to me at work." Your BFF: "Maybe she's just upset because she doesn't have a chin." 17. Routinely stalk everyone you have ever snogged on social media for no reason other than curiosity. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Paramount Pictures It's nice to know what that guy from the smoking area in freshers' week is up to now. 18. Sneak off for strategic chips in the middle of a night out when you start feeling a bit too drunk. View this photo on Instagram instagram.com A mid–night out secret meal is nothing to be ashamed of. 19. Clean up each other's sick, take off each other's makeup, and put each other to bed when you've drunk too much. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Warner Bros. You do it for her, and she'll do it for you in return. 20. Describe the vibe of someone you've just met, and know that your best friend will understand exactly what you mean. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Paramount Television Every person fits into a type, and you guys can describe every type in less than five words. 21. Played "what would I do differently?" about everyone you know. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF MTV But especially the people you hate. 22. Have each other's back when the people you're dating turn out to be the actual worst. ㅤ @FemaleBibIe If you are dating one of my girls just know that your arguments are displayed in our group chat and as a team we have written the response 03:00 PM - 30 Nov 2015 Reply Retweet Favorite ABC You can go from loving your friend's S.O. to hating them, their family, and their entire lineage within a minute. 23. Make a special type of eye contact whenever a man says something that only a man would say. View this post on This look isn't even reserved for just your female friends; it is reserved for every woman you know. 24. Pluck your eyebrows, shave your legs, and do any other form of body hair removal in front of each other. HBO You don't mind what your BFF sees. 25. Love each other unconditionally, but love each other approximately 1 million times more when drunk. Flo Perry / BuzzFeed Girl BFFs are at their best when they're drunk-complimenting each other. 26. Give each other literally everything that you could ever ask for or need. View this post on When your BFF needs something, you are 100% available to provide it.