chopper

Concise Oxford English Dictionary © 2008 Oxford University Press:
chopper/ˈtʃɒpə(r)/

▶noun

• 1 a short axe with a large blade.

  ■ a machine for chopping.

• 2 a device for regularly interrupting a current or beam.

• 3 (choppers) informal teeth.

• 4 informal a helicopter.

• 5 informal a type of motorcycle with high handlebars.

• 6 Brit. vulgar slang a man's penis.