What's up? Give me some skin!

Before I came here, I often watch the American movies and Tv show to study English. And I've always wondered the meaning of phrases people said when they met their friend, "what's up? give me some skin!"

"What's up?" is just a greeting, like "hi, how are you?" . So when we meet our friends, we can say this phrase. Also "give me some skin!" is the same as "give me five!". It means "give me hi-touch". They are really useful phrases for greeting in informal way.