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Its an alternate form of saying the word "Taint."
She tickled the area near my undercarriage that twasnt my balls or ass.
by Steve December 13, 2003
A contraction of: it was not
'Twasn't the night before christmas.
by The-Whale-Bullier April 17, 2011
The Old English new age combination of the words: It, Was, and Not.
"What night did that burglar break into the house?"

"T'wasn't the night before Christmas."

"You're a douche."
by Benjiforce1 September 30, 2010
the area on a man between the nutsack and the asshole
if twasnt there - your insides would fall out
by Beaver660 August 05, 2006