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1.
military jargon for an intensive, top-down, inside-out group cleaning of a barracks, typically in preparation for an inspection.
*reads notice*

GI PARTY THURSDAY 1900

PVT Snuffy: Shit, there's a GI party tonight.

PV2 Soupsandwitch: Let's hide in our room and pretend we didn't see the bulletin.
by 080080 August 02, 2010
 
2.
Army way of saying a big cleanup.
Do I have to start my weekend with frickin' G.I. party??
by blindstep October 01, 2010