There is a storefront jenius in all of us. That cockacoo be a storefront jenius, check him out, Tatiana. Hold upSven, this be the workings of a storefront jenius.
A term used for someone who did something so stupid, that it's comparable to the stupidity of not knowing how to spell "genius". Mostly only usable in internet speak, since jenius and genius sound the same.
"Perhaps staying up till four a.m. wasn't the best decisions."