Foreskin

The protective hoodie skin of your penis which also serves other functions as such lubrication, docking and casing.

Josh: There's only one skin, two skin, three skin... Where's my foreskin?
Dante: Toniiiight. Open my eyes.

Casing

The act of putting one's penis's head into another's foreskin. Similar to docking, except you seal it for good with glue.

Michael and David are casing each other with hot sticky gooey glue as they exchange French kisses.