fattywukup Share definition Flag A fat daddy fucked up/ when a fat bitch gives you shit/ what it sounds like when an indian (not native) say's "your'e welcome" "uh oh fattywukup"/ "she's a fattywukup"/ "thank's for the slurpy dude", "your'e fattywukup fattywukup by John senior April 9, 2007 0 0 Get merch Get the fattywukup mug. Buy Now — $32.95 See more merch