The term "goo-goo eyes" implies a foolishly sentimental, romantic, or amorous glance (as in "she made goo-goo eyes at him").
Katy Perry made goo-goo eyes at contestant Nick Merico on “American Idol” Monday. But could he sing?
— Ron Dicker, HuffPost, 19 Mar. 2019
Its first appearance was caught in English in the late 19th century. It is believed to be an alteration of goggle, which is first seen as a verb meaning "to turn the eyes to one side or the other" in the 14th century. English writer Samuel Butler, in his 17th-century narrative poem Hudibras, tersely exemplifies use of the verb in the phrase "wink, and goggle like an owl" (after hours, you might also see people goggling). In time, goggle begins to be used as an adjective to mean "protuberant" or "staring" (as in "the close-up focused on the actor's enormous goggle eyes"), which brings into focus goggle-eyed in the 18th century. The related term googly-eyed is then envisioned, but not until circa 1900.
The plural form goggles was first sighted as a designation for a pair of protective glasses in the early 18th century. The slang term beer goggles, which refers to the effects of alcohol thought of metaphorically as a pair of goggles that alter a person's perceptions especially by making others appear more attractive than they actually are, was brewed in the 1980s.