Vulturing is a term on MCPE that means picking through the remains of something previously used by other players, such as a town or base that has been abandoned. A player who is "vulturing" may take blocks they deem valuable placed in the town, and search through chests and furnaces for supplies.
Signs that an abandoned town or base has been "vultured" is the lack of any valuables in chests and furnaces, missing blocks in buildings, containments for animals that have been emptied out (either by being taken by another player or killed for valuables), and graffiti left by players after the area was abandoned.