get up on the wrong side of (the) bed

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get up on the wrong side of (the) bed

To be in a particularly and persistently irritable, unhappy, or grouchy mood or state, especially when it is out of keeping with one's normal disposition. I'm sorry I snapped at you earlier, I think I just got up on the wrong side of the bed today. Geez, the boss has been in a really bad mood all day. I guess he must have gotten up on the wrong side of bed!
See also: bed, get, of, on, side, up, wrong