To be in a bad mood or to be irritable.
This idiom originated in the early 1900s, the exact origin is not known but it is thought to have come from the idea that if you get out of bed on the wrong side, you will be in a bad mood all day.
He must have gotten out of bed on the wrong side this morning. He’s been yelling at everyone.
I’m sorry, I didn’t mean to be rude. I just got out of bed on the wrong side this morning.
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