Green’s Dictionary of Slang

1. (US black) refined [on bad = good pattern].

1935

L. Bogan ‘Shave ’Em Dry’ 🎵 All o’ you cack women, you better put on the walk, / ’cause I’m gonna get drunk and do my dirty talk.

2. a general negative, disgusting, loathsome etc.

1990		T. Winton Human Torpedo 48: Oh, cack, sir!
1997		N. Barlay Curvy Lovebox 125: They wanna know why the take is so cak.
1998		Guardian Sport 25 Sept. 16: Chateau Talbot 1986, it says. No wonder it tastes cack [...] well past it’s sell-by date.