Especially of a vehicle, its engine, etc.: that zooms; capable of travelling or accelerating quickly; (hence) impressively large, fast, or powerful; flashy.
Origin
1930s; earliest use found in Flying Magazine. From either zoom or zoom + -y.
Definition of zoomy in US English:
zoomy
adjectiveˈzuːmi
Especially of a vehicle, its engine, etc.: that zooms; capable of travelling or accelerating quickly; (hence) impressively large, fast, or powerful; flashy.
Origin
1930s; earliest use found in Flying Magazine. From either zoom or zoom + -y.