This is a cruel and disgusting yet funny
joke to do to a friend. A cup a fart is where you walk up near to the victim. Then you take your hand and cup it over your
butthole and fart. Immediately following the fart you take your cupped hand and "throw" the fart about an inch from the persons nose, opening your hand right as it gets there. In doing this it simulates the persons nose being right by your butthole when you fart. The
person will usually begin to gag and you will laugh your butt off.
I felt a huge fart cooking up so I walked over near John, cupped my hand over my
butt then gave him a nice cup a fart. After the cup a fart John almost threw up because he just inhaled
air that seconds before was inside my
butthole and near my turds.