Definition & Meaning of "hey up"in English

What does "hey up" mean in British dialectal slang?

It is used in British English, particularly in Northern England (especially Yorkshire, Lancashire, Derbyshire, and Nottinghamshire), to say hello or get someone's attention in a friendly, informal way. People typically say "Hey up, mate" or "Hey up, how's it going?" The term originated in Northern English dialect, likely from the phrase "hey up there," and remains a strong regional marker of the North of England and East Midlands.