To make a complete mess of things. Derived from the traditional archery usage where, if the 'cock' feather was uppermost, the arrow would not fly straight.
That was a real cock up.
by Tawera March 29, 2008

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Top Definition
Another word for screw-up or screwup; to err.
Nothing goes right - it's just one cock-up after another!
by mrbadguy23 December 12, 2005

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British slang for a mistake
It's my ass on the line and I don't want a cock up!
by Biggie Wilson June 02, 2005

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to mess something up. used primarily in England

also see fuck up

past tense: cocked up
That flaming retard Bush sure cocked up that war!
by Kono January 23, 2004

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A shambles. Sounds vulgar, but may not be; it may be a grouse shooting term. Customarily, shooters employ beaters to disturb birds on the ground and drive them into the air towards the guns. Normally one only shoots grouse hens, so if the beaters were by mistake to put up a grouse cock, they would warn the guns not to shoot by shouting "Don't shoot! It's a cock up!"

Can also be a transitive and intransitive verb.
One's whole shoot today was a disaster - one cock up after another. Now where's Camilla, the slapper? One feels like giving her a Dirty Sanchez. - Prince Charles

Another day, another cock-up - Tony Blair on the Iraq situation

The whole Iraq situation has cocked up badly - Tony Blair on the Iraq situation

I really cocked up Iraq, didn't I? - Tony Blair on the Iraq situation
by Tony and Cherie Blair July 21, 2006

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Something that's horribly screwed up, ruined or destroyed. Originally a British expression. Can be used as a noun or verb.
I think I cocked up my exam last night.
That car accident was a real cockup - traffic was backed up for miles!
by berkeleygirl December 07, 2005

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A cockup means someone has made a real mess of something
The universlty student had not done enough revision and made a real
cockup of his finals which meant he would have to resit them later in the year.
by Stias December 08, 2005

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