To describe something as very dry. A nasty is a Queensland term for vagina. The implication being that because of a nun's vows, her nasty will be dry.
by mt1 June 29, 2006
by MrMopar August 12, 2011
"Hasn't rained in months, its as dry as a nuns nasty"
by strtmvs January 11, 2012
beer-less place. Aussie-speak.
Well, mate..get off yer sedentary butt and go get us some Foster's! This place is dry as a nun's nasty!
by hytham_hammer July 8, 2005