The best wingman a guy could have. The monster is an individual who will distract/flirt with, and/or have sex with anything in order to help you get laid.
Man, she's got some butt ugly friends. We need to call Joe. He's the monster.
In the heat of the moment while having sex, a man may lose control and start growling like a wild animal. He may or may not remember doing this in the morning.
1) When Karl was annihilating her insides he began to growl, "MMMMM....MMMM....MONNNNNN..........MONSTERRRRRRRR!!!!!"
2) me: hey karl i heard you gave her the monster last night!
Made up by Kevin Balolong, who used the "para" in Counter-Strike but called it the monster. He uses the monster while running, which makes his recoil worse but scares people.
Kevin: THE MONSTER! *sprays with parap*
Julian: LOL IRL
Kenneth: LOLOL