Bum"per (&?;), n. [A corruption of bumbard, bombard, a large drinking vessel.] 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.
Tennyson.

2. A covered house at a theater, etc., in honor of some favorite performer. [Cant]

Bump"er (&?;), n. 1. That which bumps or causes a bump.

2. Anything which resists or deadens a bump or shock; a buffer.

• (cricket): A bouncer.
  
• (automotive): Parts at the front and back of a vehicle which are meant to absorb the impact of a collision.
  
• (Billiards): The side walls of a pool table.
  
• Large; filled to the bumpers at the top of a silo.
        We harvested a bumper crop of arugula and parsnips this year.