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1) To smoke.
2) Used in a manner referring to relax an calm down.
3) To set someone or something on fire.
4) To rapidly pummel someone with your fists.
1) Fifteen minute break, man. Time to LIGHT UP.
2) Christ, LIGHTEN UP before you have a heart attack or somethin.
3) Gun's outta ammo. Time to take the flame-thrower and LIGHT UP these alien freaks.
4) Yeah, I was a bit out of it today. I missed this one block during free-fighting and I just got my chest LIT UP!
LIGHT UP by Joshiro007 February 21, 2003
verb. to open fire at something. derived from muzzle flash of weapons/explosions.
targets identified. light 'em up.

ENEMY CONTACT!! LIGHT UP THOSE MOTHERF***ERS!
light up by nousoupi. September 28, 2010
U R jealous cuz UR jacket doesn't light up
light up by Rapture1 August 9, 2012
In football or other contact sports, to tackle or check someone in a way that results in the other guy being lifted into the air, then landing on his ass, usually resulting in pain and looking stupid.
Did you see that Avalanche game last night? Joe Sakic got lit up as soon as he got the puck!

Number 30 on the other team keeps taking cheap shots, and it looks like Nate's ready to light up the dude.
light up by B03 September 1, 2006
1. (v): To roast the hell out of someone. To put them in the spotlight just not in the way they wished.
I'm gonna light up the f*#$ out of Erik, he thinks he's Beyonce but he's more of a Charlie Sheen.
light up by JayVR July 17, 2016
verb. To cause an area to have a foul smell, usually through defecation or passing gas.
Look out; I'm about to light up that bathroom.
light up by rexctang October 13, 2006