Shit an Onix

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.