English London, United Kingdom
Idiom USED On Occasion BY Londoners
It means a long-winded story that is nonsense. The literal translation of the expression is from cock or rooster to donkey/ass.
"Some men’s whole delight is to talk of a Cock and Bull over a pot." (the earliest example in print: The Anatomy of Melancholy by Robert Burton,1621)
English London, United Kingdom
Expression USED On Occasion BY White working class
You say this when you don’t like what someone is saying or suggesting.
“You took my parking space.” “Leave it out.”