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Don´t worry , I understand your confusion Nemanja. Calling eachother " Hoca" is still  popular among University Students. I mean, In Turkiye, especially in University students call eachother " Hocam" [my teacher]

In my first day at University,  someone approached and asked me the time saying " Hocam saatin kaç ? " [My teacher , what time is it ? ] I was bit upset as I thought , I looked old so they call me as "Hoca" , but then I found out that all students call eachother as "Hocam" . 

Do you have such adressing word among students in Serbia ? or anywhere in the world I just wonder