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1.
A terrifying creature that has the face and wings of a Bat and the body and tail-fin of a fish.
Doesn't Claire look like a fishbat?
Wow that fishbat is huge!
by Fishbat Discover-er June 14, 2010
 
2.
A fish Bat is an obese woman that is a bitch.

Often referred to as fat bitches.
Ex. Broskie, check this "fish bat" out. Shes got some tig ol bitties
by Fish Filet Friday May 12, 2010