not that I live in scotland anymore - but it's not been that long....
to my mates in glasgow I usualy say "aw'right?" (all right?) as a way of greeting them. to my brother i usually say "aw'right bawbag!"... but I'll leave you to google that one to find out what it means??
these usually only works if you can fake a really annoying nasal west of scotland accent!!! (can you tell I'm from the east??? hehehehe)
you'll find a good list of glesga slang if you look for "glasgow patter" in wikipedia!
enjoy!