Get up (Wake up) on the wrong side of the bed

Get up (Wake up) on the wrong side of the bed

Meaning:

Feel a little angry and annoyed.

If you got up (woke up) on the wrong side of the bed, you feel a bit angry and irritated for no particular reason right from the start of the day.

Example:

Don't talk to the boss today. It looks like she woke up on the wrong side of the bed.

Tom's really grouchy today. He must've gotten up on the wrong side of the bed.