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The cover photo for a YouTube video. Usually to get your attention or show what the video is about.
Put boobs in the thumbnail to get more views dude!
by TheRedBeanie__ July 20, 2016
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2
the little pictures that make looking at porn so much easier and simplier
i looked at all the thumbnails of the dirty bitch
by themainevent November 17, 2003
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3
1 - The nail of the thumb
2 - Something that is small or brief; concise
3 - A printing; small and rough
1 - Look at Joe's bleeding thumbnail!
2 - Jane quickly wrote a thumbnail summary of the chapter she had read.
3 - Bob drew a thumbnail sketch of his idea before he started his actual picture.
by 7sdrawkcab May 03, 2009
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4
Someone who looks really hot seen from a distance who when viewed in close proximity turns out to be butt ugly.
That hot guy walking up the beach turned out to be a fat grandpa, what a thumbnail!
by Phil A Buster January 12, 2011
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