The Protein Pipe, is a common name for a huge cock. it gets the name protein pipe because it is a long hard shaft that sprays out protein (seimen) when erroused. Body builders are known to ejaculate into eachothers mouths so they can get the maximum amount of protein they would like so they can become hench!!
Mr Homer tried his seimen and sucked on his protein pipe to become a hench body builder and wanted to taste his salty egg whites and see what girls go through...