To forcefully "slam" a dildo into a vagina (or anus) *note- only a soft dildo can be used for the slam-dunk to take full effect.
Guy 1-"I totally slam-dunked that chick last night man"
Guy 2- "better not of used glass ;)"
by fishtits December 13, 2014
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It pretty much means "awesome" or "cool" or "radical" (when I use the word or phrase anyway)
You (or I rather) use slam-dunkafter a word like "cool".

(Just really wanted to put a word I use "as a joke" rather on this website so... yeah)
by Data ok March 8, 2017
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when you want to - or are going to have sex with a person or persons. Also can be used in past tense "slam dunked" when you have smashed said person or persons.
boy 1 - look at that thicc girl with dat noice booty
boy 2 - you should totally smash her
boy 1 - hell yeah ma boi I'm about to slam dunk her

boy 1 - look at that group of varsity college volleyball players
boy 2 - holy shit they hella fine
boy 1 - imma slam dunk the shit outta them

boy 1 - did what happened last night?
boy 2 - I slammed dunked her
boy 1 - proud of you
by gvsolt May 10, 2018
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To shag
She definitely wants slam-dunking.

Yeah, we slam-dunked

I'm gna slam-dunk that
by megamegamegamega December 4, 2010
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When your having a wank and accidently jizzed in your belly button on the full
(After wank) fuck I just slam dunked myself again
by Vette is a cunt March 21, 2019
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Where you cum on your hand and slam dunk it in your mouth gerrup 2 points for cum buckets
Owen did The slam dunk! after his orgasm #sperm#salty
by Ksjdhbdj January 28, 2022
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When you EAT SHIT everyday you get this MONOPOLISTIC thing happening where SLAM DUNK EXPANSION is the only way SHIT WILL LETVYOUR STOMACH GO

TO.
by .MANDATORY SHITEATER August 13, 2022
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