Have you seen any Instagram videos of teenagers making faces and fist-pumping to music?
It's kind of weird.
But now even soldiers are getting involved in the meme.
So what's the deal? Why are all these people uploading these videos to Instagram with the hashtag #rariworkit?
It's all because of U.K. rapper Lethal Bizzle, who sent a Snapchat message to his fans a few days ago, in which he was fist-pumping in his car and overlaid the video with the words "Rari work out".
Think @LethalBizzle had too much sugar today #rariworkout #leeeavveeeitt