Bum Flum Share definition Flag When you fart while sitting down but instead of going out of your butt cheeks it goes back into your ass. Bro, I farted in class today and I thought people were gonna hear it but it turned into a bum flum. Bum Flum by Loothoarder53 February 22, 2017 0 0 Get merch Get the Bum Flum mug. Buy Now — $32.95 See more merch
