Green’s Dictionary of Slang

1. a girlfriend.

1949		H. Ellson Duke 50: Naturally their old women were there [...] There was one of them witches that was always coming over and wiggling her behind around.
1959		Kip Tyler & The Flips ‘She’s My Witch’ 🎵 Got hair as black as night, / Got a skirt that’s ooh, so tight, / Tellin’ you I’ve got an itch / She’s my witch.

2. an ugly woman.

1953

W. Brown Run, Chico, Run (1959) 37: Chico saw now that she was a lot older than he’d thought at first. Without lipstick and rouge and powder she’d be a witch.

3. (US black) a prostitute.

1953		W. Brown Monkey On My Back (1954) 107: He’d taken one of Mamma Lin’s witches down to the Club three or four times.
1961		R.A. Norton Through Beatnik Eyeballs 79: If you rave up to some new fusebox and make the grade, it highly possible she a no-good witch.
1972		Milner & Milner Black Players 36: Recently, several of the younger players have substituted the euphemism witch. This is probably a local and recent development linked to the renewed popularity of the occult. When one young man was asked if there was any difference between the two [i.e. bitch and witch] he replied, ‘It takes a dog to catch a bitch; but it takes a warlock to catch a witch.’.

4. (US) an (attractive) young woman.

1972

D. Jenkins Semi-Tough 98: Well, sure enough, looking up there, if you looked close enough, you could plainly see that those lovely witches didn’t have any undergarments on. So staring down at all of us was lots and lots of slow-moving, southern California witch wool.