The act of unfastening your belt buckle like your gonna whip someone with it.
example 1 "Hey, why you gotta get all bucklish on me? I didn't say anything about your mom!"
example 2 "Hey man, why do you have an imprint of a belt buckle on your face? Well, I was talkin shit about my friend and didn't notice he was standing behind me the whole time getting all bucklish..."