Slang terms originated from our linguistic cultural history from our friends and family. Regional dialects at their best, friend to friend and household to household. Sometimes inspired from the Television and pop culture we consume, and occasionally terms of insult and endearment as well.
In short, a collection of dirty words.
Noun 1. Butthole Ex: Jason has the nicest back mouth 2. A deformity where someone actually has some sort of mouth/lips growing on their back Origin: Borrowed from a audio commentary on an Arrested Development episode.