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!
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!
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