A pubic bush on either the male, female or anything in between that has been neglected so long that it has never once been trimmed, shaved, waxed or maintained in anyway.
It is often seen raging out of control and in some instances it may be visible without the removal of ones clothes.
Tommy: So I was going down on this fat chick last night when i noticed she had a primordial bush going on. Nonetheless i proceeded with caution.
Matt: GET SOME!!!