abo

adjective1

1. •
   (offensive) Australian Aboriginal.

   • ‘The youngster will pick up the abo language faster than his own.’ — 1937

noun1

1. •
   (slang, offensive) An Aboriginal person.

noun2

1. •
   The most important blood type classification system for human blood transfusions.
2. •
   Initialism of access, basing, overflight.