I am not sure if they would be happy to be called a name that they don´t know the meaning of...

 Depends on what you want when you go to a bar... If you want just something to drink you use a polite form. If you want...more then you can call the bartender "caným", "þekerim", "Yakýþýklý´ v.b. The succes is guaranteed

Haha I will remember your advice when the time comes... lol 

If you want to be kind and friendly,say "canýmýn içi".

Note that, Can means life as usual.

But  in this expression,it´s meaning is diffrent.You use this expression for a person who do you like.

"Yavrum" is more vulgar but not much.It usually uses for girls.Like "baby".

Sorry about my english,i think it isn´t enought for speak!