Top Definition
Stands for "positively not".
Antonym: Posyes.
Antonym: Posyes.
Brian--are you going to that kiddie-karnival later??
Ben--uh...Posnot!! I'm going out to eat cookies with Steph later!
Ben--uh...Posnot!! I'm going out to eat cookies with Steph later!
by bananaface
May 07, 2008
