One who fligs; of uncertain meaning, possibly British dialect referring to something that moves quickly or erratically.
From flig plus agent noun suffix -er, indicating someone or something that performs the action of fligging; the base word flig remains obscurely documented in English dialect sources.
Fligger shows how English creates agent nouns so predictably (anything + -er = one who does that thing) that we can theoretically make them even if nobody knows what flig means—it's the recursive logic of morphology.
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