Orion, was the first one to guess it. Yes, its a vibrator. Or should I say "massager", either way it cracks me up. A fish vibrator, I have now truly seen it all. You might be asking what part even vibrates, uhhhhhhhhhhhhhhhhh...............the tail and the eyes. So yeah, you can get your bean all excited with a fish eye if you want and it will only set you back $22.99.
Here is the description and a link to purchase it.
Funky waterproof vibrating fish massager. Simply squeeze its side to turn it on or off. Its strong motor generates quiet vibrations in the bulgy eyes and tail. Simply relax as powerful waves of vibration sooth away the stresses and tensions of life.