Definitions by encyclopediaurbannica

sickelodeon 

When Nickelodeon is horrible and sick minded by making fun of homeless people, the mentally ill etc in television shows such as iCarly

TV Playing, iCarly is on and they make an insensitive joke about homeless people

Sarah: Wow that was actually really mean
Katy: I know, Nickelodeon is Sickelodeon

sickelodeon by encyclopediaurbannica September 11, 2011