(Some random people talking in a chat in a random game)
A: man, go siht urself.
B: what! why the profanity system didn't ban you :/
A: profanity systems go brrrrrrrr
Sound you make when fucking someone/masturbating while trying to be quiet about it. Basically sucking air in through your teeth. Sounds like a backwards hiss. This is Kirt's trademark noise.