1. spit roast - Noun
2. spit roast - Verb
The technique of roasting an animal, such as a pig, over a fire, where the cook sticks a wooden/metal rod through the animal and sets the ends on two sticks to suspend the animal over the fire.
We're having a hog spit roast at the weekend
(vulgar, slang) A sexual practice whereby two people penetrate a single sexual partner at the same time, from different ends.
To roast meat in this way.
To engage in the sexual practice called a spit roast.
Source: en.wiktionary.orgspit-roast