A Glaswegian expression used to show excitement over a subject, topic or upcoming event. This term can also be used when exhibiting glee towards something.
See also "yas"
This word can also be followed with the word bawdeep to intensify it's meaning.
Stephen is taking me to Tunisia for my birthday - yaldi!
My student loan comes in soon and I'm gonna spend it all wildly...yaldi!
We're gonna have amazing sex tonight - it's dress up day.... yaldi bawdeep!