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 4, 2011
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The day after Thursday and before Saturday (where Sunday comes afterwards)

On Rebecca Black day it is, for unknown reasons, more difficult than on any other day to pick a seat on the bus
Person 1: Hey bro, when will you be celebrating your B-day party?

Person 2: Sup bro, it will be on Rebecca Black day the 18th of September

Person 1: Aight, see you then
by KateMoon August 26, 2015
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A Paradox, something that doesn't exist
Person 1: Hey have you seen that Rebecca Black fan?

Person 2: Have you been using drugs again?
by juggi301 May 29, 2011
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An idiot who has an IQ of 31 (Rebecca Black's IQ) or less who never heard real pop music but thinks Rebecca Black is the best singer ever. She pisses you off very quickly when you say "Rebecca Black Sucks" because she will say pop music changed and criticize older pop stars like Britney Spears and Avril Lavigne and you would want to kill her by putting her head in the toilet.
Rebecca Black , Justin Bieber , Jenna Rose , idiots , Rebecca Black fan
by rebeccablackisanidiot April 24, 2011
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americas answer to the Bieber Fever.

a disease contracted when a person hears Friday by Rebecca Black and can not get the annoying, badly sung, and badly written song out of their head.
That dumb song, Friday by Rebecca Black, is stuck in my head. I think i caught the Rebecca Black Plague!
by graciebeelove April 11, 2011
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WORST. SONG. EVER!!!!!

a video that a terrible singer made that should go die in a pit. of fire. while getting shot with a machine gun. with vultures ripping at her face. while getting beat up by the rapist from the bed intruder song. while getting eaten by the monster under your bed.
Person 1: *plays Friday by Rebecca Black*
Person 2: AUUUUUUUUGGGGHHHHHHHHH REAOIHJ;GZDIRHLRAEGORHTE;OGIHEGORITHJENGB;THOIGJRNEBLHEGO;TNJIHNEGRB;HOEGKLBRHOTPOYG;JBKLH;5EOAGIHKBJY H4GERJIBOZEA4;JWVKNZFBTHES5J;ORBJKDZRHLSJEAOGIHOUEJKN4GWRLBJAHJGK.NVRBEATHK
by MyNameIsTheBaconator March 24, 2011
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the ability or strength to continue in one's pursuit of success, despite severe criticism
I'm about to get my Rebecca Black Swag on and win 1st place, and make all them haters shut up
by SudoNeem May 5, 2011
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