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In basketball, the act of running down an opposing player from behind on a fastbreak and blocking their layup or dunk just before it would be ruled goaltending. The best example is Tayshaun Prince's famous block on Reggie Miller in the 2004 NBA Playoffs. Hence the name.
You: Did you just see that block?!?!

Me: Yeah, he just got Tayshauned!!!
by #BBN July 26, 2011