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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When someone is cute in their profile picture thumbnail, but is butt ugly when you click on it.
You: *Sees a potentially cute girl's thumbnail on Facebook* Ooh! *Click*

- Larger picture reveals that the girl has three tits and a giant zit -

You: Oh god, another Thumbnail Cute girl. *Vomit*
by TCutie August 29, 2010
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When a girl or guy looks really good in their thumbnail picture on facebook, but when you open their page and see the blown up version it is less than satisfactory.
Dustin: Aww man that girl looks hot, check out her page!
(clicks open page)
Dustin: Dang, I thought she looked really good...
Gary: Yeah man, she's got thumbnail swag.
by garysmithandstuff39 August 1, 2011
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when a thumbnail pic tricks you into enlarging it and then you say no way. No s/he ain't all that.
Ooh. I thought I was gonna private message a hottie, but then I enlarged his pic and he was just thumbnail cute. Damn, guuuurl.
by bamaSeth August 30, 2015
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Online shopping with no intention of buying anything. Just admiring the product in the thumbnail, maybe looking at a few color options, and then scrolling by. Often done by college students who can't afford new stuff but can afford to ignore their professor for a little while.
Erin always sits in the back of her lectures so she can go thumbnail shopping when she gets bored with organic chemistry.
by Old Toby November 7, 2021
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A girl that looks seriously hot in their thumbnail pic on social networking sites facebook and twitter. Click them and the horrible truth is discovered.
She may be a spotty fat bitch but she makes a great thumbnail hotty
by BongoFlex August 26, 2010
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When watching porn: the video you clicked on isn't nearly as hot as you thought it would be, based on the thumbnail pictures you saw
This video of 5 army girls is such a thumbnails down, how disappointing.
by Marky E April 26, 2011
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