Top Definition
Somewhat like Godwin's Law, but instead refers to the fact that every popular YouTube video, no matter what it's about, will have at least one comment about Justin Bieber.
*Video of a talking cat advert from a few years ago*

Comment by:I_r_smurt:
OMG dis is sooooo fake!!! if u mad dis u r Justin Bieber's Boyfreind.

Me: I hate Bieber's Law so much...
by Roozler92 May 13, 2011
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