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A contraction of: it was not
'Twasn't the night before christmas.
by The-Whale-Bullier April 17, 2011
the area on a man between the nutsack and the asshole
if twasnt there - your insides would fall out
by Beaver660 August 05, 2006
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
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