What does it mean when a girl touches the tip of your nose?

I was being playful with a girl last night at a party and was standing close teasing her a bit and giving her hard time and she stroked the tip of my nose with her finger.

I like understanding body language, like when a girl touches your chest or arm it's a good thing but the tip of your nose? Never had a girl do that, what is she "saying" when she lightly touched my nose like that?
What does it mean when a girl touches the tip of your nose?
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