Green’s Dictionary of Slang

(orig. US) a loud, derisive noise, imitative of a fart.

1921		Bridgeport Telegram (CT) 19 Oct. 14/2: If Chicago loses the east will grin and give western football the jolly old Bronx cheer.
1923		N.Y. Times 10 Apr. 29: The crowd gave the hero a Bronx cheer for the effort and razzed him frequently thereafter, with some justice, too, for Ruth’s actions were an insult to the intelligence of the people who had paid their good money to see him play baseball.
1934		M. Fulcher ‘Believe Me’ in Afro-American (Baltimore, MD) 4 Aug. 13/5: I give them that derisive, horrific shockingly vulgar retorrt which is commonly known as the Bronx cheer.
1947		F. Brown Fabulous Clipjoint (1949) 191: He [...] put the horn to his lips and blew an awful Bronx cheer of a note.
1954		B. Appel Sweet Money Girl 24: You give him credit [...] and I’ll give him the old Bronx cheer.
1967		(con. 1950s) McAleer & Dickson Unit Pride (1981) 69: The air blatted out of him like a Bronx cheer.
1971		L. Bangs in Psychotic Reactions (1988) 75: As an answer to the mysteries of life it’s a Bronx cheer [...] the kind your uncle Louie used to razz the quarterback with from behind a Schlitz on Saturday afternoons.
1989		H. Rawson Dict. of Invective (1991) 42: In the aural sense, a bird is the same as a boo, Bronx cheer or raspberry.
1992		Randolph & Legman Ozark Folksongs and Folklore I 419: ‘Take this my friend!’ is accompanied by the insulting sound of a ‘mouth-fart’ or ‘Bronx cheer’ or razz(berry).
2001		‘Randy Everhard’ Tattoo of a Naked Lady 64: She huffed [...] sounding off a loud raspberry, Bronx cheer.