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bum power noun smell of stale human excrement; Am. the unmistakable smell of days-old excrement originating from someone’s undergarments; mil. vul. the stench of fermented excrement originating from a military officer’s undergarments after an extended period of time in battle; the smell that accompanies “skid marks” (see definition for “skid mark”);
Sandy then asked "why does it always smell like ass when Sue leans over the table to talk to her bridge partner?"

Kendra quickly answered "oh! That's her bum power!!"
by Hershil McGilicuttihee January 08, 2008
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