In April 2010 the informal online banter of the internet-savvy collided with the traditional and austere language of the court room.

Christopher Poole, founder of anarchic image message board 4Chan, had been called to testify during the trial of the man accused of hacking into US politician Sarah Palin's e-mail account.

During the questioning he was asked to define a catalogue of internet slang that would be familiar to many online, but which was seemingly lost on the lawyers.

At one point during the exchange, Mr Poole was asked to define "rickrolling".

"Rickroll is a meme or internet kind of trend that started on 4chan where users - it's basically a bait and switch. Users link you to a video of Rick Astley performing Never Gonna Give You Up," said Mr Poole.

"And the term "rickroll" - you said it tries to make people go to a site where they think it is going be one thing, but it is a video of Rick Astley, right?," asked the lawyer.

"Yes."

"He was some kind of singer?"

"Yes."

"It's a joke?"

"Yes."

The internet prank was just one of several terms including "lurker", "troll" and "caps" that Mr Poole was asked to explain to a seemingly baffled court.

"He was some kind of singer?"