One who guffaws; a person who laughs loudly and heartily, or an object that produces a guffawing sound.
Formed from guffaw with the addition of the agent suffix '-er', indicating one who performs the action of guffawing.
A guffer is basically someone who can't help but laugh really loud—the '-er' suffix lets us turn any verb into 'a person who does that thing,' which is why English has thousands of words like runner, swimmer, and dreamer.
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