The term FOIL USER is a job description for a FENCER, which is someone who participates in the sport of fencing. Fencing is a sport that involves two opponents attempting to score points by thrusting their swords at each other. A foil user is a FENCER who uses a foil, which is a type of sword used in fencing. The foil is a light, flexible weapon with a blunted tip and is used to score points by touching the opponent's body.