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When a person shoves a giant cone up their butt and blows smoke into a balloon so they can sniff屁 gas over and over until they go crazy and lose their mind.
My cousin did Na-Bong so hard he passed out and woke up in the trash can.
I tried Na-Bong once and now I smell屁 everywhere.
That kid did Na-Bong in the middle of math class and got sent to the principal's office.