What is the meaning of Spit_roast?

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.

A sexual practice whereby two people penetrate a single sexual partner at the same time, one orally and the other vaginally or anally.

To roast meat in this way.

To engage in the sexual practice called a spit roast.

Source: wiktionary.org