The use of grain has been a staple in the hip-hop community to describe money for quite sometime now, so "let's get this bread," isn't exactly a new phrase, but Twitter has recently taken a liking to it and the results have been hilarious.
This tweet from 2009 is the earliest tweet found on Twitter of someone acknowledging that there's bread to be had.
And this is probably the earliest Tweet that has taken that concept to a whole 'nother level.