inureturd 

meaning 'I'm not a retard' usually said in a 'retarded' voice while violently slapping ones own forehead.

used typically after yourself or someone else has made an obvious mistake that could have been easily avoided.
you could also say, instead of inuretard, inotreturded. it's always more entertaining if you slap your forehead violently and dancing

"dude, i completely failed my math quiz, i should have studied."
"inureturd"

"i chainsmoked so much i fucking spewed on everything"
"inotreturded"

inureturd by returdededed October 8, 2018