On yo dead grandma

A term used in a aggressive manner to display your passion in the truth of what you are saying or doing. It is a very escalated version of on my grandma. Not only is it on a grandma, it is yours...and she's dead. (currently or predestined)

dinkle: BRO I GOTTA FINISH THIS PAPER!
Jefferson: On yo dead grandma you not doing that shit.

dinkle: *cries* you right.

y'isn't

a southern shortened form of "you are not" or in better terms " you is not". You isnt....y'isn't.

Jimmy: Im going to the store y'isn't coming.

Gerreal: aw