Similar to the Rickrolled internet trick, where an unsuspecting websurfer is forced to watch a Rick Astley music video while on an internet forum, message board, etc. However, being Blackrolled involves the substitution of Rebecca Black's video "Friday" instead. Blackrolling is a much more trendy and powerful way to punk someone out and should be used sparingly.
I was browsing through some weird fetish porn when some asshole Blackrolled me. My boner was gone instantly.