Probably not worth trying.
I think it just stops you, because I think I tried to post it before in explaining to someone what rickrolling was.
But now that I have said that it maybe autobans I'm too scared to test.
I know there are some things that do auto-ban and some that just stop you with a warning (like if you try to post the 'Review your post' message), but I can't remember where rickroll sits.
I am 70-80% sure it just stops you since it is harmless, whereas I am certain trap/screamers like meatspin will ban you.