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Gatherasswhiff (one word) is a scientific phenomenon that occurs when a person with a large posterior reigon (read Fat Ass) sits. the air is then trapped between the cheeks of the buttocks creating what we have dubbed the "Golthorian Pocket" ass whiff molecules circulate and gather at the "tupperwarian seal" until the subject stands, expelling the accumulated particles into a singular cloud of ass whiff.

in other words, the stink that collects under a fat ass when at rest.
"Yo, did you notice the stink when the fat guy got up?"
yeah he has some Gatherasswhiff goin on!
by Professor Stank July 24, 2011
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