or lagnappe, subs. (American).See quot.
1877. S. L. CLEMENS (Mark Twain), Life on the Mississippi, p. 4045. We picked up one excellent word LAGNIAPPE. It is the equivalent of the thirteenth roll in a bakers dozen. It is something thrown in, gratis, for good measure. The custom originated in the Spanish quarter of the city. When a child or a servant buys something he finishes the operation by saying: Give me something for LAGNIAPPE. The shopman always responds . When you are invited to drink, and you say, What, again?no, Ive had enough; the other party says, But just this one time morethis is for LAGNIAPPE.
1884. G. W. CABLE, The Creoles of Louisiana, xvi. The pleasant institution of ñapathe petty gratuity added, by the retailer, to anything boughtgrew the pleasanter, drawn out into Gallicized LAGNAPPE.