When you are extremely agitated or irritated about something, you are said to be in a snit. The expression `in a snit’ can also be used to mean `in an angry mood’. It carries the suggestion that you are being unreasonably angry or annoyed. `Snit’ is mostly used in informal contexts. As for the origin, no one is really sure where the word comes from.
Example: “The children were in a snit because I refused to let them watch the match”.