the way cole sprouse looks at lili reinhart

when you stare at someone fondly and people who doesnt know your relationship can tell that you are attracted to her/him

The way Cole Sprouse and Lili Reinhart look at eachother in interviews.

Heart eyes are the eyes that Cole Sprouse has for Lili Reinhart. He's so in love with her so when he looks at her his eyes turn into hearts automatically.

the way Cole Sprouse looks at his boyfriend Kj Apa.

"Heart Eyes" refers to the dilation of the pupils that occurs when one consumes MDMA ( i.e. Molly, Ecstasy, X, Beans).
This term comes from MDMA commonly being known as the "love drug", for the sense of euphoria and connection many MDMA users have while rolling. It is not uncommon to see many users hugging or caressing one another.

a very fond, loving look someone gives to another, and a dead giveaway that they really love someone as if no one already knew.

The way you would look at jungkook if you were jimin.