Probably first used by Jalen Rose on his podcast on Grantland Channel in the video "Champagne and Campaign Hall of Fame".
Person 2: He's nothing against Deion Sanders. Dude was fast as hell. By far the fastest ever at his position.
Person 1: Yeah, he was ridiculous.
Person 2: Urballegedly he ran a 4.19 in the 40 yard dash at the NFL Draft Combine.
Person 1: Nah, man that can't be true.
Guy 2: " I don't know but urballegedly he dropped 30 in the Drew league."