Refers to someone who isn't very good at Fantasy Football. A "Jado" is usually the punchline for many jokes told amongst other participants in his own league, but is not aware of it.
Hey did you see that John got his ass kicked by his brother Dave, in Fantasy Football? Yea, he is turning out to be a real "Jado".
Jado, appropriately spelled JaDo, refers to a level of domination in fantasy football that far surpasses, and often confuses, lesser minds, resulting in delusional thoughts that they were ever actually good to begin with. In some circles the name JaDo invokes feelings of fear and uncontrollable jealousy often expressed through incredibly lame attempts to discredit his prolific legacy.
In an unfortunate turn of events, JaDo caused Matt Hannaway to feel so insecure about his manhood that he developed a sexual fetish to strange cat porn. His dark days can be seen on Datelines': To Catch a Predator That Fucks Predators.
*Also please note that Matt Hannaway has never beat jado in fantasy football, nor ever will.