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To do something which spoils a mood/atmosphere/occasion.

See also defunked

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"Don't defunk my good nature, Billy!"
by Goffboy's Dictionary on Life January 10, 2006
To fix. To clean up. To remove funky, nasty,or unknown particles or debris.
I defunked my hair brush. I defunked my kitchen, bathroom etc.
by Cheri` Trigg December 11, 2008
strait up sex. use it how you may.
becarful not to say it around doppelgangers,
los mexicanos and Steve.
they might just get a little dirrtay.
Boy: Wanna defunk?
Girl: I'm down.
Steve: Sex me up babyy!
by bobby capps. December 18, 2006