Possible Meanings

To see someone burping or belching indicates his bad mouthing and loose talk by him. To dream that you burp accompanied by a sour taste in mouth, then it is an indication that you will utter such words that may bring fear to you and those words may cause damage to you.

To dream that you have burped and fluid came out from your mouth, then it indicates that you will offer untimed expressions upon which people will rebuke and you will have to be regretful.