Acronym for Big Fat Fattie. Usually, but not necessarily, used toward a friend whose eating habits you encourage.
by ChillinJillie July 14, 2009

by Nanda June 29, 2006

Big Fat Friend. The larger less good-looking friend of the hot girl at the bar. She can sometimes cock block a guy who is trying to sleep with the hot girl. Best to combat this by deploying your wing man.
Sheila was looking so hot, I was really trying to get up in that; but her BFF kept getting in the way.
by Steve O June 17, 2006

by Bevin and Kate October 17, 2006

by Mrs.Figglehorn June 13, 2009

by little man September 13, 2005

by clreader November 13, 2009
