to rip the piss is to point fun at someone, slag them off, take the mickey or generally have a laugh at the expense of someone else.
Aye Kenny is such a wank, I'm gonna rip the piss right out him.
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After Grog Bog - The ritual trip to the toilet to take a shit the morning after a night of heavy drinking.
Dude,I'm going for my A.G.B. be right back.
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