A man/woman who always finds a way to piss someone off, ruin a fad, or someone's fun.
That bitch Kasey is such a goddamn Cunt Shitter!!
A substitute janitor who stinks up the whole bathroom after taking a massive shit
Oh, I can tell the famous shitter was here!
Our new janitor is quite the famous shitter.
The act of giving a blowjob while taking a shit.