The opposite of grool (as used in the beloved film Mean Girls). To be lumb is to be lame and dumb all at once. Can be used as an adjective, noun, or verb.
Jack: Nicolas Cage used to be grool, but everything went downhill after National Treasure 2.
Ash: Yeah, now he's just a lumb actor.

Jack: Don't be a lumbdog millionaire.
Ash: Yeah, don't be lumb and lumber.

Annabelle: This little lumb of mine, I'm gonna let it shine!
by hahahajackmyswag February 24, 2015
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"Laughing Under My Breath"
can be used for msn, texting etc..
Iqubal: knock knock
Matt:Who's there?
Iqubal: Doctor
Matt: Doctor who?
Iqubal: haha you just said it!
Matt: lumb what a loser!
by paradise92 June 10, 2009
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To screw something up and never admit to it whatever, dragging people down along the way.
You really lumbed me, right where it hurts!!!
I can smell a Lumb!!!
To lumb or not to lumb, thats is the question
by Graham Osbourne September 8, 2006
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1. To be in the state of nothing.
2. Describing a object as useless and unnesessary.
3. Describing a place where there's nothing to do, that's useless and that seems unnesessary.
Me: That Chinease finger trap is really lumb.
Mark Brownstein: Yeah, but so is Aaron Murray's hometown.
by Chris Snahnican September 20, 2007
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Acronym for "Laughing until my butt stinks."
Omg, this cat video is so funny. LUMBS!
by emilyzilla July 2, 2011
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Lumb is a famous homo-erotic acronym standing for: Lube up my butt.

It can take on two meanings. It can be a command, dictating one's gaysexual boyfriend to lubricate one's asshole, or a state-of-being, such as in the example shown below.
I woke up with oodles of lumb.

Carl, for fuck's sake, just lumb!

by Alex Yusupov August 19, 2008
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Something your boyfriend says to you when he doesn't wanna say 'love'
'I love you'
'I lumb you too'
by Finza October 21, 2006
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