Pertaining to the British show Skins, this law dictates that any two characters in a drama of a sexual nature shall, at some point in the current episode or next, engage in intercourse.
*Tony and Effy appear on screen*
Guy 1: "They're gonna bang"
Guy 2: "They're related!"
*Later in the episode "Now fuck your sister!"*
Guy 1: "Law of Skins!!!"
People, usually girls who may just be skinny because they just ARE. They might even eat, but still be skinny. It could even be due to a fast metabolism. It's hard to tell sometimes if someone has an eating disorder or if they have a fast metabolism and eats a lot, but is thin. Don't make fun of every skinny person you see! You could be wrong!
Girl 1: "Damn girl! Do you freaking even eat? You're so fuckingskinny! Go eat, you ANOREXIC BITCH!"
Girl 2: "What the fuck is your problem? I eat so much, I just have a fast metabolism. That means I have a huge appetite, but don't gain much at all. So I'm naturally skinny you idot. Bitch!"
Smiling all in a person's face, trying to gain their favor. Usually a person that is skinning and grinning is being fake or phony, flattering, or flirting. Trying to impress or befriend a person. Often they don't really like or respect the person and since they aren't being sincere, they are just skinning and grinning.
person 1: My boss always gives me so much more work to do than everybody else.
person 2: Really? Why do you think that is?
person 1: I don't know, probably because I'm not always skinning and grinning in his face like the other people there.