When a lady anus is railroaded by a penis during hard sex.
"LISA IS WALKING FUNNY TODAY, DID SHE HURT HERSELF?"

"NO, ROGER SLAM DUNKED HER IN THE ASS LAST NIGHT."
by Akaeuvasha March 29, 2016
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Derived from the British: SLAM, and the Alpha-Numeric: DUNK.
It has most recently been adopted by Devil May Cry Hero Dante.

It's most frequent use, though, is when nerdy 13 year old children believe it to be hilarious fun to exclaim SLAM DUNK whilst facing up the school bully. This, more often than not, leads to a swirlie.
Foolish Child 1: SLAM DUNK!
School Bully: Yo, Imma slam dunk your head into dat dere toilet. Fo shiz.
by Jordan 'Kakansho' Mitchell February 6, 2008
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the act of one male inserting his testical into a females vagina, often done in the pile-driver position.

warning- only for the flexible
girl-"I want you to dip your balls in me"
guy-"No shit bitch thats called the nutsack slam dunk go look it up"

{does the nutsack slam dunk}

girl-"that was amazing you really know how to dunk those balls I think i-"
guy-"not now bitch, im in the fucking zone (continues to dunk while cutting her off in mid-sentance)"
by zohan pubes December 15, 2010
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the maneuver a female makes while in the missionary position on a mattress/ table/ anything you may lay her on... grabbing the edge of said surface behind her head as if she was executing a slam dunk. this is only attained if you are performing adequately enough to yield such behavior.
dude 1: "you seem like you had a good night." "break a piece off?"
dude2: "fuck yeah, had the ol' lady doin some slam dunk action last night while i was on the job."
by s. holtzman March 2, 2009
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When you jizz in a girls hand and then she immediately slams it down back in your face.
Jill finished the game with a cum slam dunk.
by Lexie Lou April 9, 2008
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The act of achieving sexual intercourse after years of wooing your cousin or other family memeber
After many years of waiting Tommy finally achieved The Kentucky Slam Dunk with his cousin Jamie.
by dermena April 24, 2017
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Uses "slam dunk" as a synonym for amazingly, absolutely, no doubt in your mind, that a given person is physically attractive
Rebekkah looked slam dunk gorgeous at prom last night.
by Michaela Sullivan September 19, 2007
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