@Felthry the "rolled" part derives from an even earlier meme of tricking people into clicking a link to an image of a duck on wheels, which was known as "getting duckroll'd" (don't ask me where the duck on wheels came from)
i don't know why never gonna give you up in particular became the song to use for rickrolling, but i'd wager it's only so well known as a meme because rickrolling was a widespread practice back in the day
@Felthry @typhlosion I believe he's participated in it
@Felthry @typhlosion he's a fan iirc
@Felthry @typhlosion it's hard to say what he thought of it in private, but as far as Wikipedia knows, he (a) found it amusing, (b) hoped his daughter wouldn't be embarrassed by it, and (c) has moved on with his life by this point https://en.wikipedia.org/wiki/Rickrolling#Effects_on_Astley_and_reaction
(content warning for uncritical discussion of an infamous imageboard in the article - this whole thing happened several years before they became famous for mass harassment campaigns.)
His new music's really good too.
It got popular because people liked the music more than they expected to.
@typhlosion it's not exactly a good reason for your music to be popular, is it? i wonder what the singer thinks of the meme