Top Definition
A term originating on the /b/ section of the 4Chan image board, it defines when a thread has been infiltrated by a picture or a youtube link of Dan, a character made famous by his viral video on youtube.
/b/tard1: hey man check out this sweet video on xray glasses... heres the link

/b/tard2: ok.....(looks at video) damn i just danroll'd
by Ace.ace.ace April 04, 2008

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