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1.
A. When the penis rubs against the toilet while taking a shit. This is mostly caused by a poorly designed lid.

B. When a turd drops forcefully through the water, scraping the bottom of the toilet where it leaves a streak.
What's wrong with your toilet man? I was hittin' porcelain while takin a shit.

Did you hear that loud Thoomp? Well that was me hittin' porcelain in your freshly cleaned toilet.
by BoLiverwurst March 25, 2008

Words related to hittin' porcelain

penis pooping porcelain rub shit toilet