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Acronym: Completely Automated Public Turing test to Tell Computers and Humans Apart.

Tests that are easy for a human to pass, but difficult for a computer (thus preventing things like automated signups).
Ever see those registration forms that show a distorted picture and asks you to identify the word in it? That's a CAPTCHA.
by Spoom June 10, 2004
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An image with random letters and/or numbers used to prevent spammers from using computer programs to automatically register accounts and/or post/send unwanted advertisements.
This website doesn't even have a CAPTCHA. That's why there's so much spam.
by captcha April 16, 2010
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3
that annoying thing with letters and number (e.g. A7FF9YTP) that sucks a lot when you do it wrong cause you have go back and do another one.
i friggin hate captchas
by rottonknickers May 03, 2008
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4
A CAPTCHA is a test to see if you are a robot while signing in to sights, posting stuff, etc. For some reason, Internet workers decided that just because a robot can make accounts, post stuff and all that doesn't mean it can tap a βœ… on a box or select all the pictures with traffic lights and all that stuff. No, that's impossible but making users and everything isn't. Of course.
-Damn it, I have to do another CAPTCHA
-But that's so easy! Robots could do it.
-Shh,they might hear us and make it an essay about feelings

-But I have none!
-At least you know what traffic lights are
via giphy
by SwankifiedPotter October 01, 2019
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5
Those really annoying things where you have to find all cars in a picture or type out a phrase like 789obe to prove your not a human
This captcha is stupid, I probably am a robot at this rate
via giphy
by Silken Healer October 26, 2019
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6
It is a test wherein if you fail it, you're a fucking robot.
:Looks like I failed the captcha dude
:oof
*Arnold comes in*
:it looks like you're a terminator as well
by fancyarchduke December 25, 2019
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