adjective
feeling or showing extreme anger or annoyance
adverb
used to intensify the feeling of being angry or annoyed
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She was extremely pissed off when she found out about the mistake in the report.
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I'm so pissed off at him for forgetting my birthday.
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I was totally pissed off when I saw the mess he made in the kitchen.
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The constant delays in the project have really pissed me off.