noun Southwestern U.S. (chiefly Texas ).
something extra; lagniappe.
Origin of pilon
1880–85; Americanism; < Mexican Spanish pilón literally, trough, mortar, Spanish: derivative of pila basin, trough < Latin pīla mortar
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
1892, from Mexican Spanish, from Spanish pilón "sugar loaf."
Online Etymology Dictionary, © 2010 Douglas Harper