Top Definition
A cross between the process of having to shit, and the unexpected result from defecating.
Sal had to evacuate his feces, and wound up taking a shidump, which resulted in an extensive, overdrawn session of lurid defecation, thus alleviating his ardent anus.

"Ah man, don't go into the restroom, I just took one big shidump!"

"That shidump made all the difference! I feel lighter now."

"Alright let's eat, but first let me take that shidump I've been waiting for."
by SonicJives May 25, 2009
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