Verb. The often involuntary act of expelling air from one's lungs with haste after having one's mind completely blown, usually due to learning new information, hearing dope lyrics, viewing reality from a new perspective, etc.. Can be silent or accompanied by any number of noises.
They never heard so many people Soul-Exhale at the same time.
I had to Soul-Exhale because those lyrics made me see life in a completely new way.