These three wise zombies represent the Japanese maxim "Hear no evil, see no evil, speak no evil".
In the West, this saying is most often understood to mean turning a blind eye to something that is actually illegal or morally wrong.
The first zombie has an axe in his head where his ear would normally be, and is being held to the other ear, thus representing "hear no evil".
The middle zombie has lost his eyes and can no longer see, which is why he "sees no evil".
Finally, the last zombie of course represents "speak no evil" as he can't speak very easily with an arm in his mouth.
If you want a figure that has an old and traditional basis, but with a more modern and humorous spin, then this figure is perfect for you!