Hormone Monsters are monsters that aid human beings in their puberty.
There are currently five confirmed Hormone Monsters. Maurry, Connie, Rick, Tyler (former) and Gavin.
Hormones Monsters are extremely hairy, Connie is the hairiest, having hair on her entire body, while the male hormone monsters tend to only have hair on their forearms, heads and armpits.
In Season 2 Episode 9 Smooch or Share it is revealed that they swear a jizzocratic oath.