hai2u - Hai2u is a way to greet people online, like you're trying to

Hai2u is a way to greet people online, like you're trying to be cool. It’s used when you want to show off or pretend you know what you're doing.

I said "hai2u" in a group chat and no one responded.

My friend used it in a tweet and got 10 likes.

I texted my crush "hai2u" and they ignored me.