1. When you are in desperate need of a haircut. 2. When your hair is long, scraggly and in no particular shape. 3. When you have a "hair-jungle" on your head or in your underpants.
I have a hungle on my head man! Soon it will be a hainforest.
A man’s genitalia when it consists of a huge pecker and gigantic, never manicured bush.
Dude walked into the shower sporting quite a hungle, not sure how he gets his girlfriend to go down on that hairy mess, but at least he’s got a 10 inch dick that can escape it.