Pronounced T-DOT (tee-dot). This is a shortening of the abbreviation of T.O. which is already short for Toronto. The locals decided that T.O. was too much to remember (or too hard to pronounce) so it became T. because saying just the letter T doesn't work. The locals that came up with this BS have have a low I.Q. because they reduced their big city to a letter and a period while showing how stupid they are at all the same time.
"We beeez 'illin in da T-Dot!"
-"I juz can't remember the entire name of Toronto so I sez T-Dot!"
-"What kind of retard came up with T-Dot?"
-"We peeps in the T-Dot can abbreviate our city because we thinks we are just as good as NYC and LA"
-"Bro, don't EVER say T-Dot because you sound ignorant and stupid. Next time you say that in front of me, I will slap you!"
-"Yo! I wanted at first to call the T-Dot just T but I just found out that peeps it get mixed up with AT&T. WTF is AT&T?"