Commonly mistaken with the action of putting force on a bodypart where multiple
bones meet, causing the "joint" to make a cracking or popping
sound.
To
crack a joint actually means to consuming Marihuana or as the hip folk say it "to smoke a doobie" or "to smoke trees".
Me: Do you have evening plans?
Mathias: Not really, want to
crack a joint?
Me: What joint? Fingers or
toes? Why would I want to do that all evening?