/lan yap", lan"yap/ , n.
1. Chiefly Southern Louisiana and Southeast Texas. a small gift given with a purchase to a customer, by way of compliment or for good measure; bonus.
2. a gratuity or tip.
3. an unexpected or indirect benefit.
Also, lagnappe .
[ 1840-50, Amer.; la ñapa the addition, equiv. to la fem. definite article + ñapa, var. of yapa ]