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
Get the nun's nastymug. by MrMopar August 15, 2011
Get the nuns nastymug. "Hasn't rained in months, its as dry as a nuns nasty"
by strtmvs January 12, 2012
Get the dry as a nuns nastymug. 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 October 29, 2006
Get the dry as a nun's nastymug.