It's'nt

A contraction of the 3 separate words: it is not. Can be used in an argument to quickly gain the upper hand. A "yes-it-is, no-it-isn't" argument is quickly settled with this quick and convenient word.

Person 1: "yes, it is!"

Person 2: "no, It's'nt!"

by Kokomo_man February 06, 2005