Either used as a word to describe something cool as in: "Wow, that was changalangin'". Or used as question: "whats changalangin' my cracka?"... Or and unlawful changalangin' is when you are describing yourself: "MY COCK IS CHANGALANGIN' BIG"
"I am changalangin man" "Whats happenin my crackaa?" "YES I AM YELLING AT YOU WITH CAP CHANGALANGIN' LOUD!!!!!!"