This Guy-Used to mock someone who just said something dumb or something dissin you, often accompanied by pointing a finger at the person and making a funny face i.e.

"Ayo i wanted to fuck her but i was shook" *pointing* "THIS GUY!" in other words u are a dumbass.
Shoot the 1-fair fight, one on one
Steez-Your plans and or state of mind

bleh most of the others were already sed, everybody jacks NY slang, 1luv.