One who firks; a person who drives out, expels, or thrusts something; something that moves forcefully.
From 'firk' (verb) with agent noun suffix '-er' (from Old English '-ere'). Designates one who performs the action of firking.
Agent nouns with '-er' are English's most productive way of naming people doing jobs—'firker' follows the same pattern as 'teacher,' 'baker,' and 'runner,' showing how systematic language-building works beneath the surface.
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