n. — Food & Drink, Central and Eastern Canada
a food cart selling French fries and other fast foods.
Type: 1. Origin — The term is used almost exclusively in Canada (see Chart 1). The expression is likely inspired by the French name of its Quebec predecessor (see the 1948 quotation), as chip wagons were spreading from Quebec into Ontario and the Maritimes (as evidenced in Chart 2), with some use in Manitoba. Today, the term is more a marker of Ontario English and Maritimes English than Quebec English.
See also ITP Nelson, s.v. "chip wagon", marked as "Chiefly Ontario", COD-2, which labels it "Cdn".
See also: poutine (meaning 1)
Images:

Chart 1: Internet Domain Search, 23 Aug. 2012 
Chart 2: Regional Domain Search, 15 Nov. 2015