Trunk Dunk 

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."

Trunk Dunk by ChetBroda November 5, 2012

Slam Dunk In The Trunk 

A sex move where one person shoves a basketball into another persons ass.

Steve: I gave my gf a Slam Dunk In The Trunk last night!
Bruce: Wow you fit the whole ball in there?
Steve: Yeah I made it work.

Slam Dunk In The Trunk by Ya boi Sero June 21, 2022

trunkdunkadunk 

A huge ass. One that is actually discustingly huge.
it's a grosser version of podunkadunk

Holy shit, that girl had a serious podunkadunk. It was on the verge of a trunkdunkadunk.

trunkdunkadunk by whatthefuckisgrapedrink? May 13, 2006

trunkadunk 

Trunkadunk is when a person wants to have sexual intercourse with a person that fucks like an elephant.

I want that man to fuck me like a trunkadunk

trunkadunk by Trunkadunk June 18, 2017