What is what does hey with 3 y's mean?

The use of "heyyy" is generally an informal and emphatic greeting. The added "y"s are used to convey a heightened sense of friendliness, excitement, or enthusiasm compared to a simple "hey". It's commonly used in text messages, online chats, and social media to show a more playful or enthusiastic tone. The number of "y"s can vary ("hey," "heyy," "heyyy," "heyyyy," etc.), each adding a slightly increased degree of emphasis.