“These grey days of winter have a way of making the lads nervous,” Officer Mutt said. “Yes, these dreary afternoons certainly have a way of irritating me. They make me edgy. In fact, they almost make me want to climb walls,” Albert answered. This contemporary expression means to be irritable, nervous or disturbed.

winter 冬天
nervous 神经紧张的
irritate 激怒；使烦燥
edgy 易怒的；紧张不安的
contemporary expression 当代用语

人感到紧张的时候，会否爬墙，是不得而知的。然而，“climb the walls/climbing walls”却是由此得出来的用语，形容感觉心烦意乱或者紧张不安。