A fork of Rural Dictionary
When someone takes a poo in a urinal at a public washroom
P1:dude i just went into the washroom and sum1 slamdunked the urinal P2:NASTY
While fucking a girl doggystyle, preferably, in the ass, you thrust extra hard making her moan in pain/pleasure, you then shit in your hand and slam dunk it in her open mouth.
E.g.: "Dude, i totally shanghai slamdunked the entire Chinese gymnastics team. That's why they all have sour looks on their faces!"
When one tall man holds a pocket pussy and slams it down onto another tall man’s penis
“Yo, dude, come to the court cuz I’m boutta SuperBowl slamdunk Brian’s cock” “Ok bestie”
when you proceed to push a girls legs next to their head and slam her pussy in missionary, commonly assisted by a spit in the mouth
hey roy! i slamdunked her pussy last night