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A.k.a. "moocher's greeting" or "glad-handout"; it refers to where one of your "friends" beamingly approaches you with extended arm as if to greet you with a hearty palm-clasp, but instead of positioning his hand vertically the way one usually does when shaking hands, he holds his outstretched palm **upwards** so that his hand is horizontal --- this "gimme, gimme, gimme" position is how his hand is usually held whenever he is around fellow humans (duh!).
I always feel suspicious whenever someone greets me with a horizontal handshake, since it is a good indication that he is planning to ask me for a handout.
by QuacksO August 02, 2019
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