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Acronym: Brother I'd like to fuck.
N. Term applied to hot (usually older) brothers of best friends (bfs) or aquaintences. Used when around said targets sibling or other friends who know of siblingship.
Akin and sometimes used in place of the rarer Filf (Family I'd like to fuck; i/e:cousin, step siblings ect., aunts, uncles, cousins inlaw - of friends)
Derivitive of Milf
Note: does not denote an incestual connotation.
Jason: hey (passing to the kitchen)
Jess(studying, overtaken by jasons hotness): Your brothers a bilf.
Lynn: what?
Jess: Is he seeing anyone?
Lynn: What!?....your fucking crazy.
Bilf by A.L.F. August 30, 2006
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Justin's such a bilf! I'd love to stick my big cock in his tight little virgin ass!
bilf by boytoylover June 11, 2003
Related Words
Beer Induced Leg Failure. A condition where by the sufferer falls over and hurts themselves or looks stupid. Condition is caused by endulging too much in the glorious amber ale we know as beer. Symptoms which indicate a case of BILF is iminent include swaying and stumbling.
Jamie fell victim to a severe case of BILF during his night out at the pub.
BILF by SmithsonianWA July 22, 2006
That bilf is pretty hot.
bilf by Anonymous November 15, 2002
Beard I'd Like To Fuck.

Glorious beards on glorious men.
I went to the wedding. She was a real BILF!
bilf by Anonymous October 14, 2003