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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.

what the heck?
You didn't say baganga like me, so I can smack you on the forehead.

I'll smack YOU on the forehead.

Dude, it's just a game. Play along.
by Marco youth May 04, 2010