There was a boy who came back as a retard after being a famous celebrity in his previous life. Such beliefs stem the Buddhists who believe in Reincarnation, well reintardation is when someone comes back as a mentally retarded person.
It's when something is so mind-numbing, your face uncontrollably spasms into some sort of an ahegao, not out of arousal, but your brain malfunctioning. As if your brain is getting licked.
A similar thing can occur with extreme ASMR tingles, like Japanese ear-licking ASMRs.
*insert feather into your ears*
"Gwah-uah!! God dammit! Quit it!"
"Ahahaha! Your face pulled a retardao."
The act of hanging from a ceiling fan while masturbating and making airplane noises. Then shooting semen on a woman while hovering over her. Can also do with feces. Commonly called a dirty retardant drop