Happy jungle takes the term "happy trail" to a whole new level. Someone who has a happy jungle has a large amount of hair leading from their pubic area up to their navel. There is an abundance of hair rather than a simple trail.
Alexa- I just love sexy guys with a little happy trail ;)
Adam- Damn...I have a happy jungle...do I still meet the requirements? ;)
Alexa- Sorry bro, I'm not into that much hair!