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When a pool of sweat accumulates around the ass crack region. The most serious cases of this disorder are often evident through one's pants.
Chris: Wow Matt, you have horrible reservoir ass.
Matt: Hey, shutup.
Joe: Yeah Matt, your anus has reached its dew point.
by P. Ness August 04, 2006

Words related to reservoir ass

ball sweat cabbage ass jupiter jurrasic nasty swamp ass