You want to talk about something meaningful and not how your day was? But what counts as meaningful to you, though? I think asking about someone's day can be quite meaningful. A single day could change a person's entire life around for better or worse. An important realization could happen during something that's very simple in a regular day of someone's life. So with the possibility of things forever changing in one's life, I'm quite serious when I ask how someone's day was.
And yes, this is my greeting to you since you don't like small talk. XD
Hello how are u