Have lost ones mind, gone nuts.
After studying so much, I have gone cuckoo.
by Tara February 24, 2004
Someone who has lost the plot and has no idea what time of day it is. Often talks incessantly about nothing in particular, regardless of whether you are listening to them or not. Also bonkers and hatstand.
You know Nichola King? She's totally cuckoo
by Craig May 10, 2004
Noun: A Cuckoo is a person who acts in a similar way to the bird of the same name.

Generally by entering a friend's home (always a friend, otherwise that person is known as a burglar or psycopath) and eating their friend's food, using their stuff and sleeping in their bed, a person can be described as a 'Cuckoo'.

A person who is a Cuckoo may also attempt to subvert a friend's parents to their own greedy whim, making them believe he or she is needy, and in doing so neglect their biological offspring in order to feed, clothe, house and entertain the Cuckoo. Note. Cuckoos are normally ginger, quite immature, and hated by all who know them.

Ajective: (-ier,-iest).

Below: People do not have to be actual Cuckoos in order to be described as having Cuckooed something for example. Only in the most serious cases is a person actually a Cuckoo.
Verb: Cuckoo. To 'Cuckoo' something belonging to another. Basically acting as a Cuckoo and taking, using, or eating something belonging to another.
Past tense: Cuckooed. Something taken, used or eaten by a Cuckoo in the past.
Present tense: Cuckooing. When something is being taken, used or eaten by another.
Future tense: Cuckoo. If it is known that a person will take, eat or use something in the future.
Daddz - "Jesus fucking Christ, Andrew has eaten all the mayonnaise again!"
George - "I know, he's a fucking Cuckoo isn't he."

Lizzie - "Andrew has cuckooed all the bread!"
Daddz - "Not a suprise really is it... he's the cuckooiest Cuckoo I know."

Larry - "Oh for fuck sake, that fucking Andrew has gotten into the buscuits again!"
George - "Well fuck me sideways... what a fucking dirty Cuckoo bastard!"

Teddy - "Quick, stop him! He's Cuckooing all the beer!!!"
Larry - "Fucking Cuckoo!"

George - "You'd better hurry home, I dropped Andrew back there about 20 minutes ago. You know what happens when you leave a Cuckoo in your house unattended."
Lizzie - "Oh shit... oh shit, shit, shit, fucking shit! He'll fucking eat the cake my mum made earlier, shit!"
George - "What a fucking arsehole Cuckoo! Yeah you need to get back there, he'll probably shit everywhere afterwards too!"

Andrew - "Lizzie's parents think im the fucking dogs bollocks. What a pair of utter tits. Im going to steal all their food while they're out and blame it on Lizzie while I roll around in Lizzie's bed, too fat to move."
Another unknown Cuckoo - "Fucking awesome mate, yeah they do sound like complete tards."

George - "God fucking dammit! Can't you see that Andrew is a Cuckoo? He's sleeping in my fucking bed... Mary Mother of Jesus what the fucks wrong with you?!?!"
Mother - "Oh that Andrew is such a good little boy, I wish he was my son. His parents must be so mean to not feed him properly."
Andrew - "Cuckoo!"
George - "Look! He just did it again! Didn't you fucking hear that? Oh Jesus Christ you stupid fucking bitch-whore, cunt, arsehole, cumbucket you really are a retard!"
by Aryan1987 August 09, 2008
crazy and proud
guy1: yeah that's right. I'm nuts. But damn it's fun, you coming along for the ride?
guy2: you cuckoo !
by lina khlewi May 25, 2012
A word used to break the concentration of the free-throw shooter in a game of basketball. Exclaimed in falsetto.
Player 1: (begins to shoot free-throw)

Player 2: "CUCKOOOOOOO!!!!!"
by seussb_d April 08, 2006
Dishca
Dishca adds bleach to her water, she is cuckoo!
by Anonymous June 24, 2003

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