this is the nick name of a most beautiful girl in the world given by his crush. who is not able to say directly that he loves her more than anything. because that girl is introvert and doesn't talk to people if work is not needed.
it is pet name for some people given by their best friend or by their crush who doesn't know that they like them more than any thing in the world.
hersheys to the person who has given this name :- I love you