Top Definition
A magic code used on YouTube to make videos appear slightly sharper when added to the end of the video url.
I've been watching YouTube videos with the "&fmt=18" code; now it hurts to watch them without.
by Sinkbot May 31, 2008
11 Words related to &fmt=18
Makes video and sound quality a lot better on YouTube, but once in a while does the opposite or no improvement.
"&fmt=18" is awesome.
by Penis-Muncher2 March 22, 2009

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