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A fancy way to say you're jerkin' it like a maniac while thinking about a giant beanstalk and a giant bean. Real fancy.
My cousin said he was jackin' the beanstalk while eating cereal at 3 a. m.
My mom caught me jackin' the beanstalk in the hallway like a crazy person.
He was jackin' the beanstalk so loud, the neighbors called the cops.