noun, feminineplural: gniapes
Something that is added, especially something that a merchant gives to a buyer to complete the amount requested, or something extra given as a bonus; a gratuity, lagniappe
“Ce que j’en demande ? répondit le marchand ; pshaw ! je demande qu’on m’en débarrasse : prenez-la pour la gniape.” — What I'm asking? answered the merchant; pshaw! I am asking that you leave me alone: take it as a lagniappe
From Spanish la ñapa.