A person who gags, or something that causes gagging; someone who makes jokes or works in comedy that relies on gags.
From 'gag' (to choke or retch, or to silence) plus the agent suffix '-er.' The root 'gag' likely originated as onomatopoeia, mimicking the sound of choking, dating back to Middle English and possibly Norse influences.
Comedians literally call their jokes 'gags,' connecting us back to the physical comedy of vaudeville and silent films where physical choking noises were actual comedy—the word preserves a whole era of entertainment history!
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