Green’s Dictionary of Slang

(US) a party of two or more people who cover their bodies in vegetable oil to engage in sexual activity and intercourse.

1967–8		Baker et al. CUSS 156: Mazola party A wild party.
1972		B. Rodgers Queens’ Vernacular 148: mazola party an orgy where all participants grease up before sliding around on each other; a human salad.