Green’s Dictionary of Slang

slaughterhouse n.2

also slaughty
[play on killing floor n.]

(US black) anywhere a couple can indulge in sexual intercourse.

[US]E. Folb Runnin’ Down Some Lines 152: Any place designated for sex [...] killing floor, slaughter house, whip shack.
[UK]Collie Buddz ‘Wild Out’ 🎵 If a gyal get naughty she ready fi slaughty.