When 3 men participate in a sexual act where both partners 69 and one is shitting while the other is pissing in their partners mouths. A third participant is urinating on both koosers.
Me Andrew and Coop did Koos last night. I’m so gay and it was stinky.
by Straight fax 01 December 24, 2022
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koo is a sound bird-like males make when they want to attract a female.
Koo... ( You look hot, Mama!)
by Bird-like female December 11, 2008
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A complete bender who is afraid of getting in trouble.
Oliver- I'm gonna kill you *sees teacher* ohhhhh nooooooooo dave- your such a koo
by uberfan1 November 24, 2011
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Originally the result of a mancunian attempting to mimic a seagull, the word 'Koo' is best used when stoned to warn others around you that you are in said condition. It can also be used as a substitute to just about any other word in the english language, though such usage is ill-advised as it can irrevocably damage your social life and lose you some serious pulling opportunities.
1:Basil: "Kooooooooooo im fuckin well stoned"
Trevor "Koooooooo me tooooo"

2:Gary: "Are you kooing then you koo-faced koo-dodger for koo's sake?"

Ahmed: "Koo off"
by Nathaniel Bones October 5, 2006
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A Much Better Way To Pussy As An The Famale's Vagina
He Was Feeling All Up On My Koo Koo
by M.Hunt October 6, 2007
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someone who is crazy or stupid.

a word used in the movie "hotel transylvania 2"
"his mother's already nutsy koo koo!"

-dracula
by Ness EarthBound March 18, 2023
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What some people think they're saying in the Beatles song "I am the Walrus" when they're actually saying "Goo Goo G'Joob"
No Kenny, it's not "Koo Koo Kachoo" it's "Goo Goo G'Joob" read the album jacket!
by Scott C. Jones December 21, 2006
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