A large mosquito, especially one of the bigger species that is known for its painful bite.
American regional dialect term combining 'gallinule' (a type of water bird) with '-ipper' (a suffix meaning 'one that nips'), possibly because the bird seemed to nip like a mosquito, or because early users humorously compared the mosquito's bite to a chicken pecking.
The gallinipper is a regional American word that's more common in the South and shows how people invented colorful names for pests before scientific taxonomy—calling something a 'chicken nipper' is absurdly perfect for a bug that feels like it's pecking you.
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