Top Definition
To be used during the act of pooping or defocation, when one will spread their glutious maximus to produce a flat surface around the anus, similar to a deer. Producing desired effects of using 35% less toilet paper and saving time on the bowl.
Mark is tired of clogging the toilet bowl with needless toilet paper, so he decided to deer ass in order to save paper and time.
by M.L.G. August 29, 2006

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