The act of a male farting while sitting down, and as a result, the fart makes its way through the legs,and the fart bubble then bounces off your nutsack and usually tends to put a man in much discomfort.
Grant "OOO! that fart just racked me!"
George " You had a case of Racking Farts"
When a man farts while sitting with his legs closed and the fart is of such magnatude that the air passes upwards past his balls with such force that it racks him.