When you wipe your goopy slimey goodies in a upward motion upon a friends body beginning at their genitals or bellybutton and trailing all the way up to their forehead.
Dude! That chick totally gave me a Snail Trail last night, it was awesome! (Trademarked and Copyrighted by “Freeda Goodhome”)
Snail Trail which is a sexual activity when the one partner shits on the other partners groin area, which then they proceed to slide back and forth creating what is to be called a Snail Trail.
"Yo man me and my girl tried the Snail Trail last night and that shit was fucking awesome, you gotta try it."
"Bro I heard that shit was gas I've gotta talk to my girl about performing the Snail Trail on me."