A term used by whiny teenagers on tumblr who have no mental illnesses but for some unknown reason wish they did.
Tumblr User: "I've been self-diagnosed with depression, anxiety, schizophrenia, bipolar disorder, PTSD, and stage-4 fanfiction addiction."

Friend: "Have you confirmed this with a psychiatrist?"

Tumblr User: "No, doctors freak me out."
by RSiegfried September 02, 2015
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someone who 100 percent definitely has a mental illness because they want to have one for some dumb reason and any attempts to say they don't are absolutely false for some reason because 14 yr old white girls are terrifying and you must never argue with them.
white girl: I have self-diagnosed depression
Normal person: No you don't
White girl: You dare oppose me mortal?
by suckmyteninchpp January 19, 2021
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self diagnosers are the people that like fidget cubes so they say "I need it so I can focus". Then the next day they will be like "omg i feel like I need fidget constantly, Omg I have such bad adhd" . This is very annoying not to mention how fucking annoying it is to people that actually have adhd. First of all stop, second of all GET A DIAGNOSIS!! I can't even tell you how many people are like "Do you really think i can go talk to that person? I have depression, anxiety, and social anxiety!!" I am so sorry that you are feeling fidgety, nervous, or sad, but mental illness isn't an adjective! I know karen looked up 7 "100% accurate not-fake (adhd/anxiety/depression/other mental illness)" test on google and its said she had whatever mental illness, but you really can't throw around those terms. in conclusion, self diagnosers piss people off! it doesnt matter how much u rlly think you have it, GET A DIAGNOSIS! DONT GO AROUND SAYING THAT U HAVE RLLY BAD THIS OR THAT WHEN YOU PROBABLY DON'T! PLEASE JUST DON'T SAY ANYTHING ABOUT YOUR MENTAL ILLNESS THAT U ARE REALLY SURE THAT YOU MIGHT HAVE BEFORE YOU GET A DIAGNOSIS FROM A REAL DOCTOR/PSYCHOLOGIST! NOBODY WANTS TO HEAR ABOUT YOUR "STRUGGLES"! JUST SHUT UP!!!!
karen says she has ADHD because she is feeling fidgety (after drinking 7 red bulls) WHAT A self-diagnoser!
by literally can't even March 22, 2018
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Someone who 100% definitely has some sort of mental disorder simply because they say they do. Any attempts to quash this will be immediately shot down since nothing beats a self-diagnosed 14 yr old with mobile service.
Billy: Dude I am self-diagnosed with depression
Jake: No you're not
Jake proceeds to die since he has angered the mob of 14 year olds
by loolololollololoolo69 March 25, 2019
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A dumb ass who took a buzzfeed test and it said they have ADHD, and now uses it for ever excuse in the world.
Me: Are you focused?
Them: OMG! I’m so sorry, It’s just my ADHD LOL!
Me: Do you actually have ADHD, like went to a doctor?
Them: No, I took a quiz and It said I have ADHD
Me: Jesus, you’re a dumb ass, That’s just Self Diagnosed ADHD.
by Mrsymphony September 14, 2020
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A person with no life who finds different mental illnesses to look 'quirkier', or to excuse their rude behaviour. Guess what, Stacy, you do not have OCD because you like to put your pencils in a rainbow pattern!!! You also don't have ADHD because you have a sad amount of fidget toys!!!!!
person: Why aren't you paying attention? I literally just told you my cat died.

Quirky Crackhead Stacy: Oh, you didn't know? I took a buzzfeed quiz and i'm Self-diagnosing myself with adhd, deppression, did, and anxiety so stfu
by imafrog September 30, 2021
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