Green’s Dictionary of Slang

1. mouth; thus talk.

1882		E. Nye Forty Liars (1888) 31: The old man’ll give you a time check and the Oriental Grand Bounce. You hear the mellow trill of my bazoo?
1884		E. Nye Baled Hay 237: People listen to the silvery tinkle of his bazoo.
1900		T.J. Hains Mr Trunnell Mate of the Ship ‘Pirate’ Ch. ii: If he don’t stow that bazoo of his, you might ram the end of a handspike in his mouth and see if he’ll bite.
1906		J.W. Carr ‘Words from Northwest Arkansas’ in DN III:ii 126: bazoo, n. Mouth, talk. ‘Shut up your bazoo’.
1912		D. Lowrie My Life in Prison 282: There was a phony note in his bazoo that I couldn’t get away from.
1920		Ade Hand-made Fables 133: He went around blowing that he could Eat Anything, and all the Light Feeders slunk into the Background when he lifted his Bazoo.
1930		‘Dean Stiff’ Milk and Honey Route 199: Bazoo – Mouth. A term of derision. ‘Shut your bazoo!’.
1934		Weseen Dict. Amer. Sl. 306: Bazoo Loud talk; conceited talk.
1936		C. Sandburg People, Yes 80: They enjoy the oily slant-eyed spieler with his slick bazoo selling tickets and gabbing.
1950		Goldin et al. DAUL 24/1: Bazoo, n. Mouth. ‘That big bazoo will get you a chiv (knife) in your ribs yet.’.
1956		W. Pegler 30 Apr. [synd. col.] I said will you kindly shut your loud bazoo? [W&F].
1960		(con. 1940s) G. Morrill Dark Sea Running 114: That big bazoo of yours is griping all the time.
1989		H. Rawson Dict. of Invective (1991) 224: When Senator Alan Simpson (Republican, Wyoming) told reporters just before a press conference by Ronald Reagan on March 19 1987, that ‘You’re asking him things because you know he’s off-balance and you’d like to stick it in his kazoo,’ the word was rendered by The Wall Street Journal as gazoo and by The Litchfield County (Connecticut) Times as bazoo.

2. an orator.

1919

Van Loan ‘The Bone Doctor’ in Score by Innings (2004) 371: He was the local orator, the official bazoo of the village.

3. (US) the vagina.

1985

‘Jennifer Blowdryer’ Modern English 72: genitalia: female (n): Bazoo.