Bronx cheer
From Longman Dictionary of Contemporary EnglishBronx cheerBronx cheer /ˌbrɒŋks ˈtʃɪə $ ˌbrɑːŋks ˈtʃɪr/ noun [countable] American EnglishRUDE/IMPOLITE a sound that you make by sticking out your tongue and blowing, often considered rude SYN raspberry British English