Definition of "aggie"

aggie¹

noun
countable and uncountable, plural aggies
1. (informal) Marble or a marble made of agate, or one that looks as if it were made of agate.
  Quotations
  Mrs. Collins. Never seen so many children out. Snowmen in every yard this year. Billy. Look at mine, Mr Willis. Got a baseball for a nose and my best aggies for eyes.Mr. Willis. Yeah, marbles are fine—but in my day we used coal.
  1950, The Martian Chronicles, Ray Bradbury
  Most of the time it went fine; some of his classmates had so many marbles they could have opened up their own shop in smurfs, pirates, purple aggies and pink panthers.
  1999, Abdelkader Benali, Susan Massotty, Wedding by the Sea, page 60

aggie²

noun
plural aggies
1. (US, informal) An agricultural school, such as one of the state land-grant colleges.
2. (US, informal) A student or alumnus of such a school.

aggie³

adjective
comparative more aggie, superlative most aggie
1. Alternative form of aggy
  Quotations
  I got aggie like a motherfucker.
  2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World, Ballantine Books, page 191