Top Definition
In Pokemon, an Onix is a long, thin character made of a bunch of different rocks. Therefore, when you take a crap, and it is whole, but looks like its been broken up into a bunch of little balls all clumped together, you have officially Shit an Onix.
Damn, Omar, I've been holding in this crap all day. I feel like I'm about to shit an onix like a foot long.
by Creebie February 23, 2009

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