Bumble fee
col. 1. An outlandish high (or low) fee or gift, or, a made-up, improvised (in a spur) fee or gift. 2. An unexpected pay or present for a job done right.
ex – “For her magnificent work in the field of quantum physics, Marge received a bumble fee in the form of a chocolate bar”1
Origin: Comes from the odd flight pattern of bumble bees.
1 Hey, I like chocolate.