what's eating somebody?

What's eating (someone)?

What's bothering someone? Why is someone in a bad mood? What's eating Terry today? I asked him how his weekend was and he just glared at me. I've never seen her act that way before. What's eating her?
See also: eating

what’s ˈeating somebody?

(spoken) used to ask why somebody is worried, unhappy, etc: You seem a bit quiet today. What’s eating you?
See also: eating