what's bugging (someone)

What is making you feel annoyed, upset, angry, etc.? What's causing you trouble? Jeff just stormed out of the room. I wonder what's bugging him. Hey, what's bugging you? You seem really down today.

See also: bug

See also:

What's up with (someone)?
What's with (someone)?
what's with somebody?
What's up?
what's up
What's shakin' bacon?
what's cooking
What's cooking?
What's (someone's) problem?
what's your problem?

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