I've never heard of this expression before now, so you can safely assume that only a small group of people use it. That's one of the problems with urbandictionary: you can invent a phrase, get a few friends to vote for it and voila! you have "authentic slang".
Anyway: there is a common expression, "to be full of beans". This means to be full of energy (specifically, Mexican jumping beans). Perhaps your phrase is a variation.