English Toothpaste: Definition: When a partner during anal sex gets "shit dick" then takes the object out of the anus of the receiving partner and then rubs, like a toothbrush, the feces on the partner's teeth. Derivation: comes from the belief about the English having poor dentistry thus disgusting teeth.
Two guys are talking about how "nasty" their girlfriends are:
Tim: "My girlfriend is so nasty that she gave me head at the movies last night."
TJ: "Fuck that, thats not nasty. Nasty is my girlfriend, she let me give her English Toothpaste."