When a roll of Fruit by the foot is inserted into a well lubricated orifice on the body. Then a small piece is pulled out to get it started, and from there someone uses only there mouth to eat the roll, all while the person containing the snack holds it in so it doesn't pop out until it's gone.
Many variations exist on this act.
Fruit by the Foot:
-"I fruit-by-the-footed my gf's pussy last night, and then she fruit-by-the-footed my ass this morning, using the same piece."
-"I've been fruit-by-the-footing my own ass for a couple days now with the same piece."