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1.
A social occasion usually involving alcohol which either accidentally or intentionally is made up of only or nearly exclusively guys.
Intentional:
Bob: Man, this is such a wienerparty.
Jim: Yeah, great party isn't it? Girls suck.

Accidental:
Bob: Man, this is such a wienerparty.
Jim: Yeah, this party sucks. Let's go somewhere with girls.
by V2 December 23, 2004
 
2.
party dedicated to wieners of all shapes, sizes, colors, smells, and tastes. whether you have cheese down there or not, you're invited! so whip out your wiener and get down mutha fuckas.
dude, i was at this wiener party last night and saw so many kosher wieners.
by wienerpartyfuckyou December 14, 2011