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.