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Phrase(s): give someone some skin
Sl. [for two people] to touch two hands together in a special greeting, like a handshake. (One hand may be slapped down on top of the other, or they may be slapped together palm to palm with the arms held vertically. Usually said as a command.) • Hey, Bob, give me some skin! • Come over here, you guys. I want you to meet my brother and give him some skin!
McGrawhill's American Idioms And Phrasal Verbs