When you take a shit and part or all of the shit gets stuck inside the bowl. This usually causes discomfort for all other people that try and shit, as they do not want to come in contact with your shit. After multiple flushes and shits, your shit still remains.
Dude, that toilet barnacle has been on there since last friday!
by Shit, toilet, butt, fart, crap August 09, 2008