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when one engages in sexual intercourse with a drunk person they meet at a social gathering either at said social gathering or immediately thereafter.
credit completely goes to syn of EF FAME!!!
"i got a safety buzz so it would cover for any partyfucking that happened later in the night"

or

"yeah man, i went to that kegger, hit on a chick all night and then i partyfucked her"
partyfuck by axionjackson August 12, 2006
Related Words
What happens when get an erection and your pants fall down at your hot 6 year old sister's birthday party. Also see; Incest
Mom: who's up for cake?
You: *thinking to self* god i am so horny
Mom: blow out the candles sweety
You: *thinking to self* she can blow out my candle anyday
Then your pants fall down, causing everyone to immediatly stare at your giant pulsating penis, you then proceed to turn this occasion into a partyfuck.
partyfuck by aenimav August 16, 2006

partybucket 

One who believes that having sex with guys is WAY better than having sex with girls, and also believes that others don't know about either.
This cake mix was made by a partybucket.
partybucket by Magnum P.I. December 21, 2004