‘laughing out oxygen’. when you see something funny but not laugh worthy so you exhale out of your nose.
person 1: i got a girlfriend.

person 2: loo. no way.
by makenna c March 25, 2019
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The replacement of lol on the #adultswim chat channel on server irc.sorcery.net. It was created when a user named Allensnickname had a script on that would kick users when they said "lol." The users changed their expression of laughter to loo so they wouldn't get kicked.
<CyberEmperor1> Yo mama said that last night.
<Harlock> loo
by some guy December 28, 2004
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slang: Loser

Symbollically denoted by the use of the pointer finger and thumb of ones right hand to create an L shape when pressed against the forehead.

Common usage: "what a loo"
Look at that girl doing the robot...what a loo!

by Cheryl E April 09, 2006
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A much shorter way to say "I have large breasts" to save time and effort.
Guy: Hey there
Girl: Loo!
Guy: Oh... yes you do have large breasts
by Water LOO April 25, 2011
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a substance that is smoked, giving the smoker a high from contents which include THC, also called marijuana or cannabis.
This loo is really dank

Can I get a dime bag of your best loo?
by Nater_tatertot February 15, 2010
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