To crack a joint

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?