In my country, we call it “kilig.” When a guy, for instance, unexpectedly smiles at a girl who happens to have feelings for him, chances are the girl will feel so jubilant she would scream inside and smile.
Joyous, jubilant, and happy are too general to describe that specific feeling (you feel toward a person you like) that I want to describe using a “naturally occurring” word or phrase.
Can you suggest some terms?
I'm not aware of any single word that has this specific meaning, but there are various phrases that convey the idea. A common one is my heart skipped a beat. While this term is also used to describe a medical condition, it's widely recognized as being a metaphor for a sudden, intense emotional response to an event, often of a romantic nature. It is a very common metaphor in song lyrics and poetry.
"Bobby smiled at me and my heart skipped a beat."
Such a natural romantic excitement can be expressed by the words:
Exhilarate https://en.oxforddictionaries.com/definition/exhilarate
Meaning: make (someone) feel very happy, animated, or elated.
Usage: "she was exhilarated by the day's events."
Thrill https://en.oxforddictionaries.com/definition/thrill
Meaning: A wave or nervous tremor of emotion or sensation.
Usage:"a thrill of excitement ran through her"
Or how about the word Kilig itself? :)
The English language has borrowed this word from the Philippines.
Kilig https://en.oxforddictionaries.com/definition/kilig
Meaning: (of a person) exhilarated or elated by an exciting or romantic experience.
Usage:"I get kilig every time I hear this song."
