What does it mean when a girl randomly licks the side of your face?

So I was at this party, lots of booze going around. there was this blond there who was real friendly. well her me and couple others were standing around chatting about sexual things when all of a sudden she just licks the side of my face, lol. I'm kinda shy so I had no idea how to react to that. why would a girl do this?
What does it mean when a girl randomly licks the side of your face?
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