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Upon completing something epic, you gingerly touch fingertips together in expression of sheer satisfaction, it can be described as the cooler more elagant form of knucking or (dapping). It's called finb for "finger bang me bro", also called fin or finning.
"Hey nice shot, thanks man Finb me".. "Hey look over there those guys are finning, that's so cool"
by Kingdingaling33 December 08, 2014
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