For the Buenos Aires lunfardo is " cash ". The original gesture would be to extend the Palm of a hand up as he hits it is repeatedly with the knuckles on the other, to indicate that " it should be 40 tickets; in principle were 41 currencies; on the hand, one at a time, ". " TACA taca " It is an onomatopoeia of those blows, to reinforce mimicry or when one speaks or writes and hands cannot be displayed. See: trigger.
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