Entry in progress—B.P.
 
Other Toronto nicknames include “Big Smoke,” “Broadway North,” “Centre of the Universe,” “Hogtown,” “Hollywood North,” “Little Apple.” “Muddy York,” “New York of the North,” “New York Run by the Swiss,” “Queen City,” “T.O.,” “The Six” and “Toronto the Good.”
   
   
Wikipedia: Toronto 
Toronto is the provincial capital of Ontario and the most populous city in Canada, with a population of 2,731,571 in 2016. Current to 2016, the Toronto census metropolitan area (CMA), of which the majority is within the Greater Toronto Area (GTA), held a population of 5,928,040, making it Canada’s most populous CMA. Toronto is the anchor of an urban agglomeration, known as the Golden Horseshoe in Southern Ontario, located on the northwestern shore of Lake Ontario. A global city, Toronto is a centre of business, finance, arts, and culture, and is recognized as one of the most multicultural and cosmopolitan cities in the world.
       
Wikipedia: Name of Toronto
“TO” or “T.O.”, from Toronto, Ontario, or from Toronto; pronounced “Tee-Oh”. Sometimes used as T-dot.
 
Urban Dictionary
T Dot
Toronto. Derived from Toronto, Ontario or T.O. (Tee dot Oh dot)
also Tee Oh
The first time I heard T dot was in a Rascalz video.
by labelmonkey October 05, 2003
 
OCLC WorldCat record
T dot griots : an anthology of Toronto’s black storytellers
Author: Steven Green; Karen Richardson
Publisher: Victoria, B.C. : Trafford, 2004.
Edition/Format:   Print book : English
 
Maclean’s
Toronto the Good? More like Toronto the fickle
As the backlash against Drake’s new nickname for the city reminds us, Toronto can be capricious with its affection for its homegrown talents
by Adrian Lee Jul 22, 2014
(...)
After all, when Toronto’s K-4ce started calling Toronto “T-Dot”—later popularized by the Toronto rap anthem Northern Touch—it’s hard to imagine there was any backlash.
   
YouTube
Northern Touch (Official Music Video)
RascalzVEVO
Published on Nov 9, 2018
Music video by Rascalz performing Northern Touch. (C) 1998 Sony Music Entertainment Canada Inc.