Butt Fuck Loser Share definition Flag 1. A gigantic loser.2. Some who is a really big loser and a fag. (see example) Guy 1: "I hated that guy before I heard he was a Fag."Guy 2: "Yeah he's a Butt Fuck Loser." Butt Fuck Loser by cool_dood16 August 4, 2009 0 0 Get merch