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When you have an incredible an irresistible urge for an ass itch from a roid flare up or swamp ass (residue left from a lack of a good wipe after dropping a deuce) and a manual clearing of the ass is needed. Most often this is expressed with a surface scratch on the outer layer of the pant. But on occasion, when no one is looking, and only when necessary, it is a full in hand on ass scratch free for all.
I ate taco bell tonight.

"yeah, so?"

I needed to the hit the head afterwards, but I mustn't have gotten it all because now I find myself Trouser plowin trying to get at the leftovers.
by Mannimal October 02, 2014
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