N: An unofficial frat house that provides wickedly awesome parties. I.E. the Sig = Sigma and Nasty = Nasty. Adj: Describing an uber-awesome party or event.
N: Are you going to Sig-Nasty's on Friday, I heard its going to be jamungo.
Adj: That party at Iowa was Sig-Nasty
Adj: That party at Iowa was Sig-Nasty
by TFWC December 16, 2010