when a female pulls her tampon out of her vagina and throws it(dunks) in the sink.
Jamie :"hey mike, why the hell is the bathroom sink all bloody?"

Mike:"oh, Toni did a Dirty Dunk in it and still hasn't cleaned it up"
by ATXmoneymike August 10, 2010
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Dirty South Dunk (or Double Dunk) is a sexual term describing the receiving person with their ass in the air and legs by their head with the other person putting his balls in the receivers asshole.
"Damn, yo I dirty south dunked that ho from the club... I never saw an ass spread so wide... nothing but net!"
by Timmy Hartman October 4, 2006
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