The anus. It is also know as the butthole, fecal dispenser, cigar cutter, the moist, poop chute, crap cooker, colon, fartbox, shit lips, sphincter, ol' crusty, etc.
Dude, I have to pass a loaf so bad that I can hear it. If I don't get to the toilet soon it willslide past the turdstile.
A prankster who throws a turd into a discussion. Superficially, they are just another participant. But in reality, they are less interested in persuading others than in making a splash.
The back and forth in the comment section was going well, until that snickering turdster joined in.