look up any word, like blumpkin:
 
1.
"fake gay best friend"
a straight guy who does everything a real gay best friend would.
i was with my fgbf.
by pinkmice July 01, 2011
 
2.
Fucking great boyfriend
Me: "That kid's hawt"

Companion: "bet he'd be a FGBF"
by boohoo1992 June 12, 2011