Retardication 

2 or more stupid people having intercourse

That was some serious retardication when Keanu Reeves was doing Paula Abdul back in the 80s.

Retardication by Da Man with a Plan December 13, 2007

Second Hand Retardation 

When your IQ lowers due to an encounter with an individual who is low in intelligence, also can be referred to as "second hand autism".

"God I think I got second hand retardation after talking to that dumbass!"

"Dude I saw you talking to Rawny, be careful! You may get secind hand retardation after conversing with that vegetable!"

"I think I fell victim to second hand retardation I can feel my brain cells killing themselves!"

Second Hand Retardation by Tatrsos aka dank meme lord May 30, 2017

Internet Retardation

The devastating mental deterioration of Internet users. The process typically begins when visiting 4chan, Twitter, Reddit, or Discord. Users who frequent these sites often despise each other, and are all unable to function in real life. Symptoms of Internet retardation are also present in the younger generation, such as gachatards and Roblox users. Older generations who use Facebook will also suffer from Internet Retardation. Internet retardation is a global phenomena that can be prevented. Methods such as touching grass and talking to people in real life can help.

4chan btard : n*gger n*gger guys look at me I said the n word!!!!!! I hate tranny sped kids!!!!!! I'm so edgy guys!!
Twitter stan: sllaayyyyyy 💅 #cancelwhitepeople #menareevil #dreamfootfetishacceptance #whydidmydadleaveme
Redditard: Keanu big chungus 42069 lmao! I wonder why nobody laughs when I blast the Soviet national anthem!
Discord mod: I will ban you if you talk to my kitten like that. Follow #rules bud. Nobody gets in the way of me and my 9yr old anime pfp girlfriend.

Normie: I have a normal life and don't spend 25 hours a day online. How's your day? By the way, have you heard of incels? Must be tough having internet retardation.

Internet Retardation by Niga Jonsin October 19, 2022

Midnight Retardation 

Midnight retardation happens in the late hours of the night when you are so tired that you can't think of anything meaningful to say, so you just talk about bulshit topics all night with the homies.

You can't fully explain midnight retardation, but everyone's felt it once in their life.

Damn that midnight retardation be hitting hard.
I like dolplins as well.

Midnight Retardation by sasho184, sashimi April 15, 2022

Group Retardation 

Retardation when seen in a group of people, this strain of retardation seems to be quite prevalent in 80% of the dota community.

noob: Dam u suk att d0ta, u liek dat cok eh, gulp gulp
noob 2: lolololol

pro: looks like you guys are afflicted with group retardation, you should seek help at playdota.com

Group Retardation by wasabiwaffles August 1, 2011

mental retardation

me

i have mental retardation

mental retardation by Charuzu April 20, 2022

Compound Retardation 

The act of doing something stupid and or retarded followed by another unintentional but equally retarded action.

Scott: What is an example of compound retardation?

Michael: When Kevin threw up then slipped in his own vomit and broke his arm.

Compound Retardation by MER8490 June 15, 2008