Formal:
* "Guid day" (Good day)
* "How do ye do?" (How do you do?)
* "Mornin'" (Morning)
Informal:
* "Hiya" (Hi)
* "Aboot ye?" (How are you?)
* "How's it hangin'?" (How's it going?)
* "How's things?" (How are things?)
* "Haud yer wheesht!" (Be quiet!) - this is a bit cheeky and playful, meaning "hello" only in a certain context
More specific greetings:
* "Hullo, there" (Hello there)
* "G'day" (Good day)
* "Wee bit o' chat?" (Want to chat?)
Remember that Scots dialect is very diverse, and these are just a few examples. You might hear other greetings depending on the specific region and situation.