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LBM is an acronym standing for Littlebigman. Littlebigman is a combination of symbolic words, little representing his phallic size, big denoting the size of his ego and man being a mockery of the lack thereof.
An LBM is a constantly talkative, girl-obsessed teen.
The LBM should be drug out into the street and shot after a very painful lovemaking session with a claymore antipersonnel mine.
<Eric> "Using a mobile phone can slash a man's sperm count by almost a third, new research suggests.
<Eric> A study found that radiation from mobile phones appeared to have a dramatic impact not only on numbers of sperm, but also their swimming ability or "motility".
<Eric> In both cases, levels were cut by about 30%. Reductions in sperm count and motility lower the chances of conception. "
--> Littlebigman has joined #hbo
<Konrad> Hey lbm, have a cell phone?
<Littlebigman> yah
<amaroq> thank god
by William October 29, 2004
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Loose Bowel Movement aka Diahrea, when you poo comes out wet and will never ever be wiped. This happens when you eat soups too much, try it I swear it works!
Farting a wet lump that oozes down your trousers is an LBM
by MagliteR February 15, 2006
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Too have many girl problems that are actually fake, and made up to make you look cool. IE: A wanna-be pimp. Very close in annoyance to K-Twizzy
"Hes just a little LBM, he'll never have any girls."
by DragonReborn July 24, 2004
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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...
Eric: We told you to stop giving guys hand jobs!
by SanchezTheLlama July 25, 2004
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The defintion of l.b.m stands for lip biting moment where those moments are just so intense, you have nothing to say but do actions.
Today was a great day as soon as i saw her walking down the hallway i had an l.b.m
by xSobekid January 18, 2011
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