To expel gas from the stomach through the mouth. Sometimes you burp because some of the air you breathe makes it down the wrong pipe. Sometimes you burp because you've been drinking carbonated soda. It's a necessary and common body function -- the stomach was just not designed to hold and store gasses -- but it's considered very impolite in Western society.

Some folks make dainty burps, some burp like cannons. Some people can burp on purpose and on command, by swallowing air and then letting it loose, but others just don't have the knack. Burps are funny.

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