Someone who is capable of talking but always seems to choose not to.
Look at that guy in the corner, what a muter.
An interjection showing discontent, see a slightly more exaggerated version of "feh".
Greh, this completely sucks.
Abbreviation for: Are you serious?
Guy 1: Dude, I just banged my girl 3x in one night!
Guy 2: rusirius fool???