Origin: 1780–90; < Provençal picaioun small copper coin (compare French picaillons), derivative of an onomatopoetic base *pikk- beat, here referring to the coining of coppers
1804, "coin of small value," probably from Louisiana Fr. picaillon "coin worth 5 cents," earlier the Fr. name of an old copper coin of Savoy (1750), from Prov. picaioun "small copper coin," from picaio "money," of uncertain origin.