Top definition
v./n. inf(!) to unexpectedly penetrate someone's anus; often, of a heterosexual couple engaged in doggy style intercourse, when the male withdraws from the vagina, and hilariously re-inserts into the anus without prior warning.

NOT to be confused with the equally amusing Cadbury Surprise.
Betty: ... but then, as I... as I was about to... come, for some reason he pulled out... and then... *breaks down sobbing* he.. he put it... oh god! *sobs uncontrolably*
Psychiatrist 1: He gave you a BACKDOOR SURPRISE!? What a guy!!!
*hi-fives Psychiatrist 2*
Psychiatrist 2: Man, that is awesome!
by Terry Deary February 24, 2006
Mug icon

Donkey Punch Plush

10" high plush doll.

Buy the plush
the act of reaching ones hand around anothers bottom and sneaking an object in said butt hole/crack
last night i totally hit my gf with a back door surprise, she loved it
by butt grabber11 March 03, 2009
Mug icon

Golden Shower Plush

He's warmer than you think.

Buy the plush