In the context of the game "Ingress", spoofing, or being a spoofer, means the intentional
manipulation of a player's GPS location in order to access locations without actually traveling there.
This action varies based on the device being used to
play the game, but includes rapid
directional motion of a device (similar to "throwing" the device without letting go), use of GPS-altering software, etc.
Spoofing is forbidden in the game's Terms of Service.