English Etymology So called from the loud noise it makes while feeding on the wing, in the evening. Noun English Wikipedia has an article on:bullbatWikipedia bullbat (plural bullbats) A New World bird, common nighthawk (Chordeiles minor). 1963, Hal Borland, When the Legends Die:bullbats peened overhead and dived on roaring wings. Synonyms nightjar nighthawk Wikiwand - on Seamless Wikipedia browsing. On steroids.