What does it mean when a girl sends you “hey” with 3 Y's?

Ladies, if you're out there, any insight would be highly appreciated. I don't want to make a fool of myself by misinterpreting the message and coming on too strong. But at the same time, if this is a green light, I definitely don't want to miss the opportunity.

What does it mean when a girl sends you “hey” with 3 Y's?
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