Any fail/mistake in general, especially grammatical/spelling errors. Can be used as a noun, verb, adjective, etc. A multipurpose word
Pronounced: "Snuh-s"
It's also expected that one or many people yell "Snuss!" at the offender.
Bro 1: "Dude! I things last night!"
Bro 2: "Snuss! You left out the "did" dude"
Bro 1: "Damn it I snussed hardcore."