Definition & Meaning of "pissed-off"in English

What is the origin of the term "pissed-off" and how is it used?

"Pissed-off" is an English informal expression that appeared in the mid-20th century. It combines "pissed," originally meaning drunk in British English and later vulgarized to mean irritated or angry, with "off" to intensify the feeling. The term is used to describe someone who is extremely angry, annoyed, or frustrated, often in informal, conversational, or confrontational contexts. It is mildly to moderately vulgar, offensive in formal settings, but widely accepted in casual speech.