Hey is a common greeting that can actually mean many things.

A common greeting used through text messaging, usually indicating the person sending it has a high level of interest in you. The higher amount of letter y's in the "hey", the higher the thirst this person most likely has for you. If over three y's, the sender has a complete and extreme level of interest in you, and can be considered a giveaway that they would like to bang you over a piece of furniture in the near future.

someone is lowkey interested in you

the cutest way to say hello

Used when someone says something that can be a sexual reference.

It means that your girl doesn’t want your dick anymore( she wants to break up)

The girl is pyscho over you delete her from your contacts and try avoiding her