spit-roast
1. noun
a sexual position in which a woman (or a man) performs oral sex on one man whilst being penetrated by another from behind; the woman (or man) receiving such attention. The two erect penises necessary for this activity create the illusory image of a single spit going in one end and out the other. Mainly heterosexual usage UK, 1998
2. verb
to have sex as an active participant in the spit-roast position UK, 2003