search urban dictionary for the full definition, but rickrolling is when someone gives you a think and you don’t know what its for, and that link leads to a very annoying Rick Astley music video.
First there was duck rolling on 4chans /b/ board it was used when linking other users to what they thought was something relavent when it only turned out to be a duck with some wheels and a random song. Then that later spawned Rick Rolling