(Noun) The mucus-like substance that comes sputtering out of your ass a few weeks after having post-nasal drip.
Guy 1: Man, are you okay in there? The sounds are just beautiful.
Guy2: Yeah, only a case of Mucass, don't worry about it.
Guy1: Eugh, gross.
by Fantastic_Voyage February 27, 2017
Get the mucass mug.