[its_just_me]

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what does 'five-balling' mean?

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from urbandictionary.com
five balled:

when playing pool (english) and the black is sunk and a player sill has 5 of his/her balls on the table they must drop their trousers and walk around the table.
(if playing alternative rules then the 5 ball rule does not exist unless you make up a forfeit)

"haha! five balled you!"
*drops trousers*
"haha nice underwear!"
"pwnt!"