1) a souped-up motorcycle, which may or
may not have been modified from its factory condition.
2) a
helicopter. Any kind of
helicopter -- military, police/emergency, media (news), or civilian.
1) A classic example of a "chopper" motorcycle is the one ridden by Peter Fonda in the movie "Easy
Rider", which was emblazoned with a design of the American
flag.
2) I saw a chopper (
helicopter) come to airlift the injured person from the scene of the accident to the hospital.