A fork of Rural Dictionary
How's it hangin' is a very informal way to say hello to your fellow. What is actually hanging, is evident from the following example.
- Hi, Mike, how's it hangin'? - A little bit to the left.
How's it hangin is a polite greeting from one man to another. "It", in the context, is the man's penis. Presumably if it's hanging well, the man is doing well.
Jerry: Hey John, how's it hangin? John: Long and low, Jerry, long and low! Jerry: that's great!