a very horny,ugly ass beast that is very human like in physical form. It has a vagina, penis and breasts so that it can fuck anyone that it wants to. Many that have been fucked by this type of monster have reported receiving sexually transmitted diseases. These monsters are believed to be invincible as no one has found its weakness. Because of this and the fact that they can chase down cars, they will catch you. Running away will only cost you your life and they will just fuck your dead body. It is believed that they live solely off of fucking.
I just got fucked by a sex monster and now I have HIV
1. a person who has sex a lot
2. a beast who has sex with other beasts
1. i am definitely a sex monster
2. wow, look at that sex monster, hollerrr