Joe: Hey! Have you heard about this new song? It sounds like this: nana na nanaaa....
Mary: Oh man! You're humming it so badly that I've no idea what was that.
By Savina
Hum Hum
Phrase used as synonim to thinking about the problem which had apperaed or as a respons for moronicquestion.
A: Do you want to make some quests or stop playing?
B: hum hum