The phrase "in a pet" refers to someone who is in a bad mood, often as a result of a particular issue or annoyance. There are several synonyms for this phrase that can be used interchangeably, including "in a huff," "in a temper," "in a snit," and "in a fit." Each of these phrases conveys the same sense of irritation or anger over something that has occurred, and they can be used in a variety of contexts to describe a wide range of emotional states. By using synonyms for this phrase, writers and speakers can add variety to their language while still conveying the same essential meaning.