1.) To constantly talk about things you have no concept of.

2.) To be annoying and irritating right out of the box.
LBM...we don't care. No, we really don't care. In fact, I never want to hear you mention your girl problems ever again.
by Boxer July 19, 2004
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LBM is an irritating Teenage Soap Opera. Constantly complaining about his/her/its tummy, and non-existant girl problems, you can find LBM in his/her/its natural habitat of Victoria Secret, sniffing the bras.
LBM: It involved hands under things...
STL:STFU LBM
Eric: We told you to stop giving guys hand jobs!
by SanchezTheLlama July 25, 2004
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LBM is to annoying as Frogblast is to Halo tricking.

Littlebigman fails to go more than six sentences without saying the word 'girl'; its a proven fact. Littlebigman in himself is an oxymoron: he is big, yet little, and (heres the funny part) a man. He is not big, or little, he is pudgy. He is not a man, he is... we don't know what it is.
<Littlebigman> and then blah blah blah blah blah blah blah girl blah blah girl blah blah gay sex blah blah girl and gaysex blah blah.
by Eric Smith July 29, 2004
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n. Someone who is annoying, and constantly talks about stuff which noone evens cares about.

v. To discuss a subject which everyone in the room finds extremely annoying and no one cares about
1. God, you frigging LBM. Just shut up.

2. Don't mind him, he's LBM'ing.
by Gutupio February 24, 2005
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Little Big Man Syndrome - A psychological affliction commonly found in short people. Also called a WEE MAN paradox, Napoleon syndrome, or short dude sabotage.
Dude this four foot five mofo in my class threatened to pile drive me into the ground. he totally has LBMS!
by Lismon Wajes master of bitches December 22, 2008
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Mildly annoying teeanager.

............................likes pain
* SFLegend climbs into a tank, whittles down LBM|ph00d's health with the machine gun then finishes him with a tank round under his feet, Watch LBM|ph00d Fly, boy.
by SF Legend July 21, 2004
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Little Booties Matter 🎶🎵 (LBM)
Don’t be mad girl little booties matter (LBM) 😅
by ChubbyFlyersTV December 7, 2018
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