Jo-Brosexual Share definition Flag A male who has a love for or an obsession with the Jonas Brothers and their music. "I caught my brother being a Jo-Brosexual dancing & singing along with Jonas Brothers music." Jo-Brosexual by Allissa Rose January 2, 2009 0 0 Get merch Get the Jo-Brosexual mug. Buy Now — $32.95 See more merch