Similar to crop dusting, vapor trailing involves farting while walking, but in this case instead of passing someone standing still, the person is walking behind you. Based on the vapor trails that high flying jets make.
I just vapor trailed the poor sap behind me like I was an Airbus A330.
Oregon trail is used to describe the trail of hair that leads from a persons chest to their gentials. This is similar to a happy trail but the person is from Oregon.
Jason really needs to trim his Oregon Trail if he ever wants me to blow him.