hayhennyEtymologyFrom Spanish jejenes, plural of jején (“midge”).hayhenny means A small biting midge (especially in Latin America); a noseeum. Lexicurio rates it Sui generis — a strength score of 100 out of 100.nounA small biting midge (especially in Latin America); a noseeum.““That's only a hayhenny,” he explained. “Hayhennies are lilttle flies. The rising sun is waking 'em up.””