Fuckass Share definition Flag Is a combination of fuck and ass basically, the meaning of this word is saying someone is stupid or acting stupid or saying thatโs stupid, you know ? Shalimar: *does something stupid* Yanna: Bitch you acting fuckass rn sit tf downfuckass ๐ค ๐๐ฝ๐ช๐๐ค Fuckass by rcdvn September 29, 2018