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1.
A term used to describe the activity of smoking weed out of a bowl.
"Hey man, are we fittin to smoke?"
"Yeah man, in about 2 minutes, it'll be bowl thirty"
 
2.
when the weed-man is running late; when you needed to smoke a bowl thirty minutes ago.
"Where the hell is Dave? it's bowl thirty already!"; "It's bowl thirty I'm heading home to smoke my stash!"
by SMART SMOKER January 25, 2008