A fool, moron, or otherwise ignorant person. A person pretending to be street smart, but lacking it entirely. Often used to refer to a person who makes a fool of themselves while trying to impress others.
Definitions include: a member of a British subculture characterized by low- or middle-class youths with characteristics such as wearing athletic clothing, Burberry brand clothing, and gold chains, listening to rap music, driving low-end but "souped up" automobiles, and engaging in drunken and other crass behavior.
Definitions include: To forget about it. Expression of coming to the end of something of previous concern. To express complete unconcern. "I started to get upset at what she had done, but then I decided PISS ON IT." "I tried to warn him of what was going on and he just ignored me so PISS ON IT"