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1- To be mischevious and/or rather naughty.
2- An outlandish event.
Person one: So i was sexting my boyfriend yesterday..
Person two: Oh that's so rauncus!
Rauncus by Rauncosity November 27, 2011
Related Words

Raunchsticles 

a name given to someone who frequently acts in a dirty, perverse manner.
Yo, Raunchsticles, you want to grab lunch today.
Raunchsticles by Mrpizzaman55 February 24, 2009

raunchster 

(n) A person who is exceedingly raunchy, to the degree of tackiness.
Brian was being such a raunchster at the party! He kept pinching chicks' asses!
raunchster by Meg the Nerdy Dragon October 26, 2005
Acting in a borderline inappropriate manner, dare even say raunchy, in a public scene due to a personal accomplishment (or at least an accomplishment that one could experience vicariously) or endeavor in which the outcome was so congenial that it set in motion a series of outbursts of violent and pseudo sensual verbal/body language.
After Texas Tech beat Texas aTm in the big XII basketball tournament, thanks in part to Mike Singletary's 29 consecutive 2nd half points, I caused a raucus throughout College Station.
Raucus by Urijah Thunder March 12, 2009