A high five with two hands, also known as a high ten.
"You scored with those twins? Double five!"
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When you go for a traditional two handed high-five and once the opposite party's hands are high in the air, you punch 'em right in the zipper.
Coined by Johnny Knoxville on Conan.
"Don't go trusting ol' Jim over there, he'll trick you into a double high-five."
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