Top Definition
When two people you are engaging in coitis the male genitalia disengage the vagina and enter the anus swiftly much like a slam dunk in basketball.
Male Friend 1- "So the other night i was having sex with this girl who had a huge ass..."
Male Friend 2- "Did you give her a trunk dunk?!?!?"
Male Friend 1- "Yep, she was shocked at first, but fell in love with it shortly after."
by ChetBroda May 25, 2012
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