GTAer noun2 •(Canada, rare) A native or inhabitant of the Greater Toronto Area, the most populous urban region in Southern Ontario, Canada.Downtown Toronto and anywhere near the lake is indeed that balmy. Spring was late @ my parent's house in Mississauga (western suburb for non-GTAers) and I think last hard frost was a week/10 days ago. — 2001 •(rare) A player of the Grand Theft Auto series of action-adventure video games.See you GTAers around!.^([sic]) — 1998 formsGTAers