Bumper definitions

bŭm'pər
A usually metal or rubber bar attached to either end of a motor vehicle, such as a truck or car, to absorb impact in a collision.
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A protective device for absorbing shocks or impeding contact.
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A drinking vessel filled to the brim.
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Something extraordinarily large.
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Extraordinarily abundant or full.

A bumper crop of corn.

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A cup or glass filled to the brim.
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Anything unusually large of its kind.
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Unusually large or abundant.

A bumper crop.

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1859, Dickens, A tale of two cities, chapter 11

Sydney Carton drank the punch at a great rate; drank it by bumpers, looking at his friend.

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(colloquial) Anything large or successful (now usually attributively).
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(automotive) Parts at the front and back of a vehicle which are meant to absorb the impact of a collision; fender.
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Any mechanical device used to absorb an impact, soften a collision, or protect against impact.
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Someone or something that bumps.
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(cricket) A bouncer.
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(billiards) A side wall of a pool table.
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(broadcasting) A short ditty or jingle used to separate a show from the advertisements.
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(slang, dated) A covered house at a theatre, etc., in honour of some favourite performer.
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(colloquial) Large; filled to the bumpers at the top of a silo.

We harvested a bumper crop of arugula and parsnips this year.

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Origin of bumper

From bump + -er.