To boil vigorously.
To be in an agitated or angry mental state, as if boiling.
To buzz with activity.
To foam in an agitated manner, as if boiling.
To roast meat in this way.
To engage in the sexual practice called a spit roast.
A sexual practice whereby two men service a single sexual partner at the same time, from different ends.
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.