What is Jamaican Barbeque?
1.
A party or gathering in which guests are allowed to invite themselves over to someone's house or car in order to smoke
Hey man, I just got paid today. Do you want to buy an ounce of weed, call up some people, and have a Jamaican Barbeque?
See
2.
When guests invite themselves over to smoke weed.
"Hey man, the door was unlocked, we let ourselves in, can we
burn with you guys?"
"Man what is this? A "Jamaican Barbeque "?
See