goo-goo eyes
A visibly smitten or enamored facial expression, as of one who is romantically interested in someone else. Well, if you keep staring at her with goo-goo eyes, she'll know you like her sooner than later!
goo-goo eyes
(ˈgugu ˈɑɪz) n. flirtatious eyes. (Often with make.) Who’s the chick over there with the goo-goo eyes?