Green’s Dictionary of Slang

vacuum n.

[both ‘suck’]

1. the vagina.

[UK]Harris’s List of Covent-Garden Ladies 39: Not being willing to brook disappointment, a favorite Hairdresser is often called to fiill up her vacuum.
[UK]Farmer & Henley Sl. and Its Analogues.

2. (US campus) a hearty eater.

[US] P. Munro Sl. U.