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1.
Slag for 'Deffinitly Not!'
"Wanna kiss my ass?" "Def Not!"
by Briggmyster June 16, 2006

Words related to Def Not

bye deff not defnot def yes em hell no hue no poop sugille tone
 
2.
Most definitely never, ever EVER going to happen.
Your good friend: "You and that girl are cute together!"
You: "Def-not."
by Logan Hahn February 14, 2009