definition: Well done; awesome; nice
etymology: refers to the feeling of excellence resulting from a basketball successfully entering the hoop, thereby hitting the back of the net.
Ex.
Plato: "Yo, son. I done did it. See that good-lookin broad over there? I totally just tapped that ass."
Poopyface McMasterson: "Fo real, whodi? Back of the net, dawg. Back of the net."
Plato: "Yo, Poopyface, you wanna get blunk?"
Poopyface McMasterson: "Oh hell yes. Back of the net, dawg. Back of the net."
Plato: "Word"