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Actually there's a lot of meaning.. depending on how you say it.. It sometimes mean abbreviation of the word "Papa" means a father or you can also use it to call a person who is older than you or a girl can used it to call her older crush.. hehehe those are just my opinions what is the meaning for me..

Ohh haha :P
I can call my father pap in Russian as well :D
Thank you for the knowledge!