A chewing tobacco "dip" (either in long-cut or pouch form) put it one's upper lip. This is commonly done to reduce the need to spit, as less saliva comes in contact with the tobacco.
B-boy: "Let's throw in a top soil before we head into the stadium."
Topsoil is a word used to insult someone. Similar to calling someone a "dirt sack" but is much worse. Topsoil is worse than be being called "dirt" because top soil is what you walk on.
Pat *takes a hit out of rotation*
Tom: "Dude you're fucking top soil"