gad (Noun) — An anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension, sweating, trembling, lightheadedness or irritability etc that has lasted for more than six months.
gad (Noun) — A sharp prod fixed to a rider's heel and used to urge a horse onward. ex. "cowboys know not to squat with their gads on"
gad (Verb) — Wander aimlessly in search of pleasure.