Green’s Dictionary of Slang

(US) sex appeal.

1942		R.L. Bellem ‘Daughter of Murder’ Dan Turner – Hollywood Detective Dec. 🌐 She was something extra special in the way of youthful she-male yumph.
1943		R.L. Bellem ‘Phoney Shakedown’ Dan Turner - Hollywood Detective Feb. 🌐 A miniature Mexican chili-pepper whose brunette yumph was matched only by her red hot temper.