Does Ticked off Mean?

1 : to make angry or indignant the cancellation really ticked me off. 2 : reprimand, rebuke his father ticked him off for his impudence.

Is ticked off slang?

Infuriate, make angry. For example, That article ticked me off. [Colloquial; second half of 1900s] For a vulgar synonym, see piss off.

Why do we say ticked off?

The earliest being the 1800s, meaning “a small mark or dot used to indicate a sale.” The more figurative use of the phrase can be traced back to the early 1900s. It was first published in Wilfred Owen's Collected Letters in 1915: He has been 'ticked-off' four or five times for it…