Sense 1:
The Erebid moth (Ascalapha odorata) which is also known as Black Witch, Sorrow moth, and Mourning moth, is called Duppy Bat in Jamaica.
Origin : circa 18th century. From bvb dupe or Akan adɔpe; a ghost or spirit.
The bat is believed to be the spirit of a deceased person in the
manifestation of a bat. It is usually not at rest and has returned as a harbinger or to live in its abode among its old
family and friends.
Sense 2: a
silly person; an idiot
Nuff duppy bats live in the abandoned house.
Last night a duppy bat flew inside
the house. The entire place was turned
upside down.
Cho! A duppy bat, that. (That is a duppy bat) sense 2.