Green’s Dictionary of Slang

(US campus/black) an unpleasant, unattractive and/or promiscuous woman.

1934		H. Sebastian ‘Negro Sl. in Lincoln University’ in AS IX:4 288: biffer (sometimes shortened to biff). A girl not considered good-looking; a girl of low character.
1938		Flash! (Wash., D.C.) 21 Feb. 11/1: biffer—Young lady who may have all the education, money and personality in the world but she is ever so homely.
1960		‘Parlance of Hip’ in R.G. Reisner Jazz Titans 150: Biffer: an ugly girl.
1966		Trimble 5000 Adult Sex Words and Phrases 25: biff (Sl.) n. A homely Prostitute.
1971		Winick & Kinsie Lively Commerce 41: ‘Biffer,’ ‘prossie,’ ‘she-she,’ ‘pig-meat’ are some other slang designations.
1980		J.L. Gwaltney Drylongso 232: They start soundin’ on ’em, callin’ ’em biffas and whores just for doin’ what they begged ’em to do!
1989		P. Munro Sl. U. 36: biff. 1. dumb, dunce-like girl.
2023		X 19 Dec. 🌐 [of a puppy] WonkyDonk [...] 4 days old, eats like a biffer but maintains her figure - I want to be a WonkyDonk!!!!