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1.
A person that has had so many ER visits, that the scroll bar is needed to see them all. Previously called frequent flyers, but that implied that we appreciated their business and were happy to give them a discount for their return. The term scroller has more of a negative connotation, meaning someone that abuses the system.
From the book Haiku STAT!

Too many visits.
Scroll bar needed to see them.
You are a “scroller.”
by Haikuist March 22, 2012
 
2.
A bit of code that makes words travel accross the screen, usually found in a demo or intro.
I put particle scroller in my invitro for Assembly '02.
by FoxMajik January 28, 2004