Usually an expression of shock, to express ones disbelief to a fucked up situation.
"Gary... I think i may have aids"
"Cocks in a Cup! your fucked mate.."
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This is normally a really random word that can be repeated over and over for continual satisfaction. For more effect say it like an 40's Italian Gangster. "Carks Essss"
"Hello Paul, would you like a juicy pineapple? lol"
"No, yer a cocks arse"
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