Stands for "lower bum fat". LBF is the portion of ass-cheek visible when girls wear short denim shorts, otherwise known as denim underwear.
Girl 1: I'm wearing my new denim shorts today!
Girl 2: Yeah, but your LBF is showing, they're more like denim underwear.
by ravernousrhino August 13, 2012
Lunch Break Fuck
"How was work today? Awesome I got a LBF in with Lisa the accountant"
by MJM_LBF July 10, 2009
Let's Be Friends

A common let-down heard by nice-guys everywhere.
I had a really great time tonight, but I'm not ready for a relationship. Let's Be Friends.
by jhocking July 10, 2005
"Lance Bass Faggot."
An acronym that pokes fun of the recent outing of Lance Bass, the deep-voiced member of the defunct boy band *nsync. This phrase is most commonly used as a joke among male friends, and can be compared to phrases like "fairy", "pansy", "fruitcake", or even "gaylord." Why just call your friend a "fag" when they can be an LBF?
Man, Pete is too chicken to go talk to that girl. What an LBF.

C'mon, dude, you can take another shot! What are you, an LBF or something?
by cooooolio August 18, 2006
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