The Designated Ugly Fat Friend found in a group of girls out on the town. She may be a Cockblocker unless your group of guys has someone drunk enough to take her attention away from ruining your night.
"Hey Joe, you take care of the DUFFer so I can get to the hot one."
Any person who has grey hair; Any person who spends 5 minutes stepping off a curb; Any person who can't, for crime's sake, drive faster than 25 miles per hour anywhere.
Holy Shiite! I almost ran into that dang duffer. He can't even see over the steering wheel, let alone the speedometer! Take the bus! Crime!!