Bumper

Bum·per

Bumper

n.
  1. A cup or glass filled to the brim, or till the liquor runs over, particularly in drinking a health or toast.
    He frothed his bumpers to the brim.
  2. A covered house at a theater, etc., in honor of some favorite performer. [Cant]

Bumper

n.
  1. That which bumps or causes a bump.
  2. Anything which resists or deadens a bump or shock, such as a metal or rubber rim extending from an object; a buffer.
  3. A protective guard device, usually of metal or rubber, attached horizontally to the front or rear of the frame of a vehicle, designed to resist or deaden a bump or shock, and to prevent damage to the main frame of the vehicle in low-velocity collisions. (Motor vehicles)