Crowdcaster 

The person who sits in the crowd and feels the need to point out everything that is going on in the game very loudly to whoever he is sitting with. He or she usually has extensive knowledge of the sport at which they are attending, but feel the need to put this on display loudly and obnoxiously on every single play.

Guy 1: Never go to a game with Nick.

Guy 2: Why?

Guy 1: He's a crowdcaster. He was shouting out every play in excruciating detail. I was thinking 'Dude shut up; we all know he missed the ball. You don't have to explain how he should have done it!'

Guy 2: I hate crowdcasters. Anyone crowdcasting should be banned from sports!

Crowdcaster by Tex-Mex Shawn C. September 30, 2010

crowdcasting 

A passive method of crowdsourcing help from your friends by changing your IM and Facebook status. Your (real) friends can assist in the call to action by changing their status as well in a crowdcast chain.

Joey -> "I have an xbox and a monitor but no TV. I can't play rock band. I am a nerd dying inside."
Jini's IM status -> "Does anybody have an xbox vga cable they can lend me?"
Joey -> Jini: "Thanks for crowdcasting."

crowdcasting by bigpika January 15, 2009