When someone acts kooky, nuts, wacky, insane or a screwball.
The football fans were acting cuckoo banana bread over the bad call.
by CNA Monster January 30, 2020
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A plain old cuckoo/weirdo person.
Bruh, why are you acting so Cuckoo Mr. Dog”
by Yadina Riddle May 30, 2021
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When people are put in a house and are all fucked by the same man
Hey,last night I got fucked real hard in cuckoo house
by Joseph Walsh June 13, 2017
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When the iPhone of everyone within earshot goes off with an alert or meeting invitation at the same time.
Our VP set off a Cupertino cuckoo-clock when he invited our department to the non-denominational seasonal party.
by MisterInvisible December 23, 2011
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Adjective: Someone who will happily talk about nonsense that only matters to them which ultimately confuses or bores the listener.
Person 1: Did you hear Kayleigh going on at the meeting about her Uber Eats orders this week?

Person 2: She’s cuckoo for cocoa puffs, just like that crazy bird was for Cocoa Puffs cereal.
by Vanderveer October 13, 2021
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A very powerful drama movie with some laughs starring Jack Nicholson. He plays a convict who faked insanity to go to mental hospital. There he finds Nurse Ratched who is an evil nurse
One Flew Over the Cuckoo's Nest is one of the best movies ever made. Won for the Best Picture Oscar award in 1975.
by Sagzag June 1, 2004
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