惚れた腫れた
Meanings
1
head over heels; madly in love
Fixed expression often used mockingly or teasingly about someone being overly love-struck. The phrase pairs two verbs meaning 'to fall in love' and 'to be inflamed with passion', emphasizing a state of romantic infatuation.
Those two seem so head over heels that they can't focus on work.
I thought being madly in love was only for the young, but apparently not.