A complete loser; a dud of a human being; a person who has absolutely nothing going for them, but still proceeds to act like they are something special.
Also, a dusty looking person with bad style.
Someone who should pretty much quit life and work at mcdonald's for the remainder of their useless existance.
Internet term. Verb. To invalidate your overly liberal position in an online debate by making veiled threats against the life or sexual dignity of your opponent's spouse or child, or faked threats against your own life.