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1.
A person from the telephone area code 905, which comprises North America's third-largest suburban sprawl, and surrounds the area code 416, Toronto's dense, cosmopolitan downtown core.

Used imply that someone is bland, boring, unsophisticated and/or ignorant.

See antonym: 416er
I can't stand this place; it's full of 905ers.

Why do 905ers wear all that cheaply made, ill-fitting American shopping-mall clothing?
by ZoodlesForEveryone January 11, 2005