If you describe someone as having cabin fever, you mean that they feel restless and irritable because they have been indoors in one place for too long.
I've got cabin fever. I've got to get out of here.
cabin fever in British English
noun
mainly Canadian
acute depression resulting from being isolated or sharing cramped quarters in the wilderness, esp during the long northern winter
cabin fever in American English
US
a condition of increased anxiety, tension, boredom, etc. caused by living for some time in a confined space or an isolated area, esp.in winter
Examples of 'cabin fever' in a sentence
cabin fever
At the last instant Joy had jumped in, saying that if she didn't get out of Cottonwood Wells she would get cabin fever.