Spanish phrase
No estoy de humor.
Meaning
I'm not in the mood.
When to use it
It expresses a lack of desire to do something. It is used to gently decline invitations or to avoid giving detailed reasons for low energy.
Example dialogue
¿Quieres ir al cine esta noche?
Do you want to go to the movies tonight?
No estoy de humor para ir al cine hoy.
I'm not in the mood to go to the movies today.