machine gun starter

When a car battery doesn't have enough juice to turn over the engine, but has enough to make the starter produce a very loud fast clicking noise, which is very close to the sound made by many sub machine guns.

Will usually scare the living shit out of anyone standing near your car.

Dude 1: That guy had a machine gun starter. It scared the fuck out off me!

Dude 2: Yeah, i gave him a jump later.