Green’s Dictionary of Slang

1. (US) an exciting, attractive young woman.

1934		M. Fulcher ‘Believe Me’ in Afro-American (Baltimore, MD) 24 Nov. 12/4: Juliette Lane, the Baltimore hot-cha.
1935		M. Fulcher ‘Believe Me’ in Afro-American (Baltimore, MD) 27 Apr. 5/5: Dot Fitzhugh, the Washington hotcha [ibid] 23 Mar. 12/4: That Harlem hotcha.
1978		(con. WWII) T. Sanchez Hollywoodland (1981) 176: You been making some hotcha ouchimagooga?

2. (US black) energy, vim.

1936

A.E. Duckett ‘Truckin ’round Brooklyn’ in N.Y. Age 8 Feb. 7/1: Hal Reese, the lad with hot-cha.

3. (orig. US) hot jazz music, any flashy, exciting entertainment .

1937		Lil Hardin Armstrong ‘I’m on a Sit-Down Strike for Rhythm’ 🎵 But you stole my rhythm, you stole my hotcha, / Ain’t nothin’ left for me!
1959		‘Monroe Fry’ Sex, Vice & Business 128: The plainclothesman's ears were greeted with an unseemly but real-gone rock-and-roll hotch-cha coming over a radio.