One who acts as if they have eatin a lot of beans then feels they have become falsely confident from them until they reach a level genious. Also seen as a highly stupid acting person.
"Mikey get in here to start your homework."
"No. I thinkI have to poop"
"You beanious, get your dirty rectum in here!"
it's a word for when a person typically known for being "lax" on concentration makes an excellent joke/phrase/saying on the spot, is momentarily surprised, cannot replicate it so congratulates themselves and never looks back on it