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M. B. S. W. means Must be smokin weed! Someone who’s acting like a complete idiot because they’re high on weed.
My buddy just ran into a tree yelling, 'I’m the king of the jungle!' M. B. S. W. for sure.
She texted me, 'I’m gonna eat a whole pizza by myself.' That’s M. B. S. W. energy.
He tried to talk to the ceiling and called it his ex. Classic M. B. S. W.