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A "low five" invented by a Cannabis connoisseur known as "Charlie" whereas the downward "five" is executed with then retracted as quickly possible with a severe lack of the force expected when receiving a "high five".

(It can also be used in a sideways variation)

Know how I can tell he's tired? He gave you the 'Charlie Tap'.
by SlurrinVerbs January 21, 2009
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