From Longman Dictionary of Contemporary Englishbe climbing the wallsbe climbing the wallsspokenNERVOUS to become extremely anxious, annoyed, or impatient If I don’t get a drink soon, I’ll be climbing the walls. → climb
Examples from the Corpus
be climbing the walls• If I drank another cup of coffee, I'd be climbing the walls.• Realizes he is moving in her desperately, as if he is climbing the walls of a closed building. 