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1.
The best thing to yell when there is a party of one sex only, kinda like sausage fest
BUTT PARTY in Johns hotel room!
by Dr. Ben Dover November 19, 2007
 
2.
A group of usually non-commissioned members (enlisted), in charge of operating the targets at the end of a firing range.
Damn it, Sergeant Dick put me on the butt party.
by Fearbeforeme October 30, 2009