The mischievous, notorious arch nemesis of Sportacus in Lazy Town, played by Stèfan Karl Stefánsson. Famous for the hit single "We Are Number One".
It is also used as a name for someone very mentally ill to the point where they act like they are a supervillain, and steal things from others on purpose for attention.
Mike: Dude, Josh became a Robbie Rotten.
Rich: Yikes.
An elderly couple who have finished having intercourse with each other, lying in bed while spooning.
Jack: Dude, I just caught my grandparents being Rusty Spoons.
Terrance: Damn.