Definitions by Knaw

armchair referee 

A person who loudly criticises the referee's decisions - and often the players' performances - in a televised rugby or football match.

He's become a right armchair referee since he had to give up playing.

armchair referee by Knaw January 12, 2009

XTube 

A pornographic version of the popular YouTube website, allowing users to post their personal adult videos.

Did you see that hot guy on XTube?

XTube by Knaw September 15, 2008