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This acronym usually refers to a Boi (as in the gay type - refer to boi) I (would) Like (to) F*ck (as in have sex with).

The connotation of boi implies that the one saying bilf is not a boi. Or in other words is not straight.

So basically, when a "straight" guy refers to a gay guy as someone the former would like to have sex with.

This is a definition that breaks gender norms and has been used among straight buddies, and has been accepted as a norm, regardless of its context, sarcastic or serious.
The straight guy points at the hot gay guy in the club and tells his buddy, "Hey there is a BILF!" His buddy laughs and concurs.
BILF by theseducer April 13, 2009
"Baby I'd Like to Fuck"

-Stewie Griffin, from Family Guy
BILF at 12 o'clock
BILF by DJ Kit January 17, 2011
Brother I'd Like to Fuck. A Good example of one is Shawn Wilkes, brother of Brandon, who can easily be checked out when one goes to his house. If you are lucky you may see him shirtless!
Lynn: Lindsey, I went to Brandon's house last night and Shawn was there! He is such a bilf!
bilf by Frows December 20, 2004
Bolduc I'd like to fuck.
Damn, that's a bilf. A Bolduc I'd like to fuck.
bilf by BILF December 26, 2007
Baby i'd like to fuck
"man that bilf is fucking sexyyy. I'd tap that."
bilf by Klaus1234 June 9, 2009
a very good looking butler that you would like to interact sexually with.
oh my lord, did you see that Bilf that opend the door for me...he was gorgeous
Bilf by JDM240sx May 1, 2011
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