It's a game. When you burp, you or your friends say "baganga". Then you have to put your thumb to your forehead and wiggle your fingers, pointed upward. If you don't, you'll get smacked on the forehead.
BUUURRRRPPP! "Baganga"
SMACK.
what the heck?
You didn't say baganga like me, so I can smack you on the forehead.
usually an aquatic practices teacher or math teacher, is brainless to the point where it hurts, thinks he is funny but is dry, likes men but not gay, has no drip, has one child
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi