a combanation of "legit" and "for real"
Person X: I'm sooo tired!! All nighters can really take it outta you, man!
Person Y: Forgit. I think I'ma go hit the hay stack.
A cross between for sure, and ligit (legitimate). It can usually replace either word in a sentence.
Situation 1:
Kyle- Damn man, that girl's fine!
Greg- Oh snap, that's forgit!
Situation 2:
Will- Dude, he didn't get all the way around on that 720.
Amo- No man, I saw it from a nice angle, that shit's forgit.