put-put
Pronunciation: (put'put', -put"), [key] — n., v., -put•ted, -put•ting.
—n. - the sound made by a small internal-combustion engine or imitative of its operation.
- a small internal-combustion engine, or something, as a boat or model airplane, equipped with one: the sound of distant put-puts on the lake.
—v.i. - to operate with sounds suggesting a put-put, as a small motor or motor-driven device.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.