Noun
A mock serenade of discordant noises, made with kettles, tin horns, etc., designed to annoy and insult.
Source: Webster's dictionaryCritic and humorist Louis Leroy wrote a scathing review in the newspaper Le Charivari in which, making wordplay with the title of Claude Monet's Impression, Sunrise (Impression, soleil levant), he gave the artists the name by which they became known. Source: Internet