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to insert ones own digits in ones own anus before swirling said digit in an adversary's drink. preferably if the owner of the drink is drinking a spirit mixed with coke
I just gave that john prick a solid bum and coke
by grubability September 15, 2009
Drug-fuelled Cottaging in a cocktail bar or other upmarket drinking establishment toilet.
Did you come her straight from home tonight?

No, I popped into the Lord Lucan for a quick Bum and Coke.
by cuksocker November 07, 2010