mounster Posted in M Best definition mounster A can of monster energy with a dead mouse at the bottom. I was drinking a monster this afternoon and I got to the end of the can and saw a dead mouse at the bottom and found out I was actually drinking a mounster. How satisfied are you with the definition? Looking for mounster meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 22 times.