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To be completely owned by the use or involvement of a piano
This can involve dropping a piano on someones head or slipping over when drunk and bashing your head on the piano

Often used when someone playing the piano mucks up the piece due to the unwanted involvement of a third person (usually mocking/shouting)
PIANST (lol): Ah man i ruined my grade 5 piece thanks to your bottle rocket!

PRANKSTER : ...pianowned
by Aleb December 31, 2007
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