A person will try to trick, or "rickroll" you by means of displaying any false information, or commonly a false "video" that shows interest to the community; deception.
The term was developed by users on forums that have located the video and have known that is has no particular value or even remotely related to the game/community which is directed to develop anger by the user who clicks the link.
"Rickrolled" is a fruition of the earlier word, "Duckrolled" which is the same meaning of deception.
The practice of tricking people into viewing this song is called the Rickroll, trolls who do it are called Rickrollers, and people who are tricked by this are "Rickroll'D" or "Rickrolled"
This term and practice is being spread out mainly by the gaming community and by online forums. Usually a user may announce a video that has probably been leaked or a video that has value to the community; when the link actually leads them to the same video created by "cotter548" called "Rickroll'D" or "Rickrolled."
In due time this term may cause conflict among forums; due to false information spreading out coming into conflict with true information; or by means of "The Boy Who Cried Wolf."
Person 1: Dude, I got rickrolled twice today.. not cool.
Person 2: Who or what is rickroll... I've heard it way too many times today.
Person 1: Like u think you are getting a link to something cool and that fucking video hits.
Forum Newbie: Dudes, check out this new leaked video of this new mod coming out for the game!
Forum Regular: omfg not that video again!
Forum Regular2: I've been rickrolled too many times.. I know the lyrics already!
Forum Admin: WHAT THE F***
Popularized by the SomethingAwful and World of Warcraft forums in March of 2007, it's starting to disperse onto more websites as of May.
Rick Rolling can also be a real life act of the music clip - normally by playing the song and having an impostor sing or dance to the video. Thus "Rick Rolling" the unsuspecting audience.
It is popular on video's that promise exclusive footage - such as a GTA4 gameplay, Or Halo3 exclusive.
Clicking the link to a video of Rick Astley's "Never Gonna Give You Up", thus being Rick Rolled.