When your "Lurking" on facebook and you believe to have spotted an attractive female through a thumbnail picture, so you decide to click on the thumbnail only to find out its a nappy hoe that resembles one of the Hanson brothers.
Jake: "WHOAH WHOAH WHOAH, is that bitch sexy??"

*click*

Jake: "Eww.. WTF.. is Hanson in town...what a Thumbnail bitch? "
by bigdaddymitch0745 November 19, 2009
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When browsing friends networks ( like Hi5 or Facebox) and you see a Hot ( Mae or female) and you get hyped because they look hot, then you click on the picture and realize that they aren`t hot at all
I was browsing Hi5 and saw a smoking hot chick, i watched her pictures and realized that she was only a thumbnail hottie
by Froosh January 27, 2007
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Also known as "Fake Thumbnail", a controversial type of thumbnail on YouTube in which a YouTuber would use this type of thumbnail to grab user's attention and then trick them into thinking there is a actual content on the video itself, such as a image edited with photoshop of the content in the video to even exaggerate the result as well.
"I have ever seen a misleading thumbnail featuring my hobbies i love like Apple products and other high-quality products." - The creator of this definition
by Ryan900USAYT March 7, 2022
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A person, usually female, that is only attractive in a thumbnail image. This is similar to HFFA.
Josh is browsing on the Internet when he sees a thumbnail of a girl.
Josh: Oh, she's hot!
Josh clicks on the image
Josh: Shit, she's a thumbnail beauty!
Josh then proceeds to vomit all over the screen, probably in an attempt to shield his eyes from the girl's ugliness.
by Christopher Eccleston June 6, 2013
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A word used when there is a hole in a wall, usually in a video game, where the character/person must make it through a small hole that may seem rather hard to fit in. The image is then saved and uses as a thumbnail on YouTube videos.
YouTuber: That would make a great thumbnail hole!
by Kummalii October 12, 2021
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A thumbnail betrayal occurs on social networking sites such as facebook (the application 'are you interested' for example) when a male or female look really hot in their display picture, so u click thinking 'hell yea this is sweet' only to find out that they must have used some sort of magic 'grotesque removing' camera to take that picture with because they are, in fact, like a pile of shit which has been puked on. . attached to a bean bag chair. . with hair. .
dude: sweet this girl is hot *clicks*
dude 2: yea she looks sweet, look at her other photos
dude: omg ewwwww that was a pure thumbnail betrayal!! *gips*
by muse rock August 11, 2008
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A thumbnail that shows something that doesn't appear in the video. Commonly found in Best Trends and Trend Spot videos.
5 FORTNITE YOUTUBERS WHO CAUGHT GHOSTS ON CAMERAS!!!! (SCARY)

The clickbait thumbnail shows a witch outside Tfue's window and it says Tfue... I found you!
by BigSmoke40 November 24, 2020
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