an irritating individual with no sense of a social filter and no realization of the implication of his actions; socially inept.

Jaguar.

A word popularised on the messageboards of UK music website Drowned in Sound to describe a post purporting to be from a fan of a band, when in fact it is a friend of the band, or the band themselves, attempting to promote their music.
JAG is a 'DiSism'.

n. a person characterized by boorish behavior, selfishness, or flagrant stupidity.

-Short form of jag-off.
-Similar to a dickhead.
-Not to be confused with wanker, which has an implication of ineptitude.
-Used mainly by Americans from cities between Chicago and Boston.

a state of intoxication; to be buzzed or drunk

1. To screw up
2. A situation that has been screwed up

Jag: Verb shortened from the term jag-off.
To mess up or lose something, especially money.