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An online video that garners so much traffic in a short amount of time that it leads the server hosting it to crash.
Joss Whedon's Dr. Horrible was a real sitebuster.
by Mr. Brady Brim-DeForest July 27, 2008
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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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2
An online video that when released attracts so much traffic that it crashes your site, the same way a blockbuster movie sells out theaters.
"Dr. Horrible should prove to be a profitable venture in the end, and will probably establish itself as the 'sitebuster' hit of the summer..." – Tubefilter
by Tubefilter July 21, 2008
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