Top definition
F*@# Billy' sister in Butt
Martin: "Hey Billy you know your hot sister will I'm goin to FBSIB her."
Billy:"Martin im goin to kick your ass (as billys face gets all read)"
Martin"FBSIB, you jabroni"
by COLOSSUS April 01, 2005
Get the mug
Get a FBSIB mug for your buddy Nathalie.