To remove the back portion of a toilet and take a shit in there. No one looks in there and in a few days will stink and no one will know to look there. Usually done to someone you dont like.
"I just slam dunked in Jim's toilet! It's going to stink in two days."
by alfamonke June 10, 2005
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Noun - A person who has testes and a vagina, but has no penis.
My friend DPC is a Slam Dunk!
by K and M Pimpius August 28, 2006
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Random acts of Duncan. Everybody knows a dude named Duncan that is wildly unpredictable. A "Slam Dunk" is an action, or an opinion, that is not beneficial to society. Slam Dunks are usually ridiculed for being so out of place and detrimental to a good time (ie: parties, epic Facebook threads, and conversations), but have been known to produce laughs. In general, Slam Dunks are usually a bad thing.

In speech, "Slam Dunk" is usually used before or after the word "Bitch"
Dude 1: "We had this post on our Facebook group. It had a thousand comments on it, but Duncan deleted it"
Dude 2: "What!? Why'd you do it, man?"
Duncan: "It was my post bitch... Slam Dunk!"

Dude 1: "Did Duncan just walk through the drive-thru?"
Dude 2: "Yes sir... Slam Dunk"

Dude 1: "Hey Duncan, How was Spring Break?"
Duncan: "Well, I don't remember half of it, so.... Slam Dunk, bitch"
by W3B5T3R April 16, 2013
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The act of punching the asshole of another person, usually as a surprise attack or otherwise a torture.
Gavin slam dunked Annie! 50 Points!
by Anonymous August 27, 2003
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a complete fabrication, lie, falsehood, misstatement of facts, perjury
George Tenet told Congress that it was a "slam dunk" certainty that Saddam had weapons, because technically slam dunk doesn't mean anything when applied to a true/false statement. (Also see Perjury)
by Stinky Weazaltits March 21, 2007
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when you’re having sex with someone and right as you’re about to cum, you pull out and release into your hand. you then take that hand and smack your partner on the stomach, nutin hand.
Only real relationships have performed The Slam Dunk.
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