bug·gy1 / ˈbəgē/ • n. (pl. -gies) a small or light vehicle, in particular: ∎ a small motor vehicle, typically one with an open top: a golf buggy. ∎ short for baby buggy. ∎ hist. a light, horse-drawn vehicle for one or two people, with two or four wheels.bug·gy2 • adj. (-gi·er, -gi·est) 1. infested with bugs. ∎ (of a computer program or system) faulty in operation. 2. inf. mad; insane.