Lagniappe \La*gniappe\, Lagnappe \La*gnappe"\, n. [Also spelled
{lagnappe}.][Etym. uncertain.]
1. In Louisiana, a trifling present given to customers by
tradesmen; a gratuity.
[1913 Webster]
Lagniappe . . .is something thrown in, gratis, for
good measure. --Mark Twain.
[Webster 1913 Suppl.]
2. A tip or gratuity.
[PJC]
3. Hence: Anything obtained gratuitously or unexpectedly.
[PJC]