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.
I'll smack YOU on the forehead.
Dude, it's just a game. Play along.