Bumper \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]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Bumper \Bump"er\, n.

1. That which bumps or causes a bump.

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

Source: Webster's Revised Unabridged Dictionary (1913)