What does Belch Wash mean?

Belch Wash meaning in Urban Dictionary

just like "jet wash" (the rapidly moving fumes expelled from a jet motor), "Belch Wash" could be the preferably vile and unpleasant gasses generated by a belch expelled into the proximity of another person who unwittingly and unavoidably walks through it, ingesting the odorous contents of the belcher's belly and expresses a bad reaction.