STFUBGMMAS Share definition Flag A short for a sexist line. Shut the fuck up bitch, go make me a sandwich! Boy: I am so smrat. Girl: It is spelled s-m-a-r-t. Boy: STFUBGMMAS STFUBGMMAS by Cockie Monster October 27, 2010 0 0 Get merch Get the STFUBGMMAS mug. Buy Now — $32.95 See more merch