First pronounced as such by Encyclopedia Dramatica, the Power 5 is a collection of the five most overused shock sites/images/gifs used on the internet today. They are: lemonparty (old man orgy), goatse (stretched asshole), meatspin (blurry gif of buttsecks), tubgirl (girl eating shit water from her anus), and hai2u (blowjob while vomiting). Once you have seen the Power 5, it can never be unseen again. If you compare it to the Pain Series or Offended however, the Power 5 will seem like child's play.
Bob just sent me a link to the Power 5, I need brain bleach now...
...5 minutes later
OH GOD THE PAIN SERIES NO NO NO!
by An_Ediot November 7, 2011
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A group of 5 highly gifted individuals that when together, can overcome all odds. Often seen running with the Fine 5, these group of guys are pure SAVAGES.
by Chansler the Rapper June 2, 2018
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Originally stated on encyclopedia dramatica, the power 5 are the 5 most overused shock images, from the very deep end of the cesspool that is also known as the internet, which have spread beyond plausible human control. Once seen, they will continually haunt your dreams and burn within your retinas, until you view the ultimate dread of the Pain series, the fresh pain of which will erase this weak image and replace it with something a little worse than death by burning penis. You have been warned.
Bob: Let's give Joe a shock
Bill: Why not use one of the power 5?
Bob: Oh, Good idea.

.....5 hours later
Joe: HOLY SHIT OMGWTF WHAT IS THIS I DON'T EVEN-
by Demaesia June 15, 2011
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