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When someone says something really awkward or stupid.

Or folding a hand in texas hold'em without another player making a bet.
Alex "He had too much sugar"
Rob "...No he's just high"
James "Wow Alex you just heinered"

Dumbass "Fold"
Not dumbass "Wow way to heiner dumbass nobody bet!"
by That guy who doesn't heiner December 31, 2010
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