When someone asks you to do a favor, and you don't plan on doing it, you say def for sure and gradually walk away like nothing happened
Rebensaltz: I'm failing Chemistry, do you think I can take a picture of your notes?
Ray and Ed: Yeah def for sure man, I'll def hit you up with that!
by ZROSENEDI May 10, 2016
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When simply saying 'yes' just isn't good enough. It's like saying yes, but X10. Usually used with an exclamation point
Kat: I'm so hungry
Reuben: Do you wanna get some Chinese food?
Kat: For def sure!
by Kitty Kat Wants Your Soul March 21, 2008
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