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1.
When a song is so terrible that it becomes eerily catchy, putting you under somewhat of a spell causing you bob your head

This can also happen when listening to artists such as Lil B, V-Nasty, and OJ Da Juiceman
The Rebecca Black Effect is the reason why lil b has 50,000,000 views on youtube, and why "Friday" arguably the worst song released in the history of music have gained so much attention recently.
by 330BLACKMOSES December 03, 2011