You burp when you are 'gobbling' down food , at the same time you are swallowing air, not breathing air, that air has to leave the stomach, so after a [very] short period of time it travels up your...
SOME THING THAT CAN BE PASSED ON SUCH AS AN ILLNESS, LIKE THE FLU.In terms of human geo. it is the distance-controlled spreading of an idea, innovation, or some other item through a local population...
A burp is when you have an ''air bubble'' in your stomach cause from eating fastly or drinking carbonation. It is nothing bad just air coming from your stomach to your mouth. :-)