This stemmed from a conversation I had with my roommates about celebrities we find attractive. its not as concrete as a crush, not as lax as liking them in a platonic way. just a thing for them that you may or may not be able to put your finger on - usually tied to a very specific personality trait/characteristic/etc.
small stupid maybe-flirty-maybe-i'm-reading-too-much-into-this back and forth with a friend, classmate, colleague just to put a little pep in your step!