A contraction of: it was not
'Twasn't the night before christmas.
25👍 7👎
Its an alternate form of saying the word "Taint."
She tickled the area near my undercarriage that twasnt my balls or ass.
11👍 40👎
An alternative of "it wasn't"
Someone: I think cars 3 was a good movie!
Logan: 'twasn't