When you've had a bad day and bust into your stoner friend's house and snatch the joint from his or her hand you are then said to have joint custody.
by Farle77 June 27, 2010
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When you know you can't finish a joint on your own, so you share it with a homie.
Kaitlin: "Hey, I want to buy a joint but I get way too blitzed when I smoke by myself "

Tim: "no problem, wanna have joint custody? I'll split it with you!"
by Amy911 October 20, 2017
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