A slur against autistic/other mentally-disabled people. It's often used by allistics (non- autistic people) as a joke or insult. Don't be that guy.
"LMAO, look at me, I'm a retard, durrrr!"
"Are you autistic?"
"Fuck no."
"Then stop being an ableist fuckwad, shit-for-brains."
"Are you autistic?"
"Fuck no."
"Then stop being an ableist fuckwad, shit-for-brains."
by internetgay October 19, 2017
Get the Retardmug. 
Someone who is really...really mentally disabled and who has serious difficulties with even the most basic of tasks, for example walking. A common trait of a retard is tripping over vacuums in art rooms.
by tommydelli December 20, 2017
Get the retardmug. 
When you see a tumblr feminist crying their whale ass off, a kid laughing at nothing, or person who has no mental ailness doing some stupid shit.
tumblr feminist: Ok, so I'm mad at you racist sexist homophobic sexist whalist sizeist male heterophobes islamphobic fucks insulting me, I identify as a Yak-9P Fighter jet equipped with nonswept wings and 20mm cannons, with the pilot being Misha Yatobo blah blah blah blah hentai anime blah blah blah are you still listening blah blah males should die
Todd: She's a fucking retard.
Adam: Agreed.
Sam: Retards think alike.... *oncoming swarm of feminists*
Todd: She's a fucking retard.
Adam: Agreed.
Sam: Retards think alike.... *oncoming swarm of feminists*
by weird eye the science guy November 13, 2018
Get the retardmug. by whyisthisapassword May 28, 2018
Get the Retardationmug. josh is retarded.
by smhhhhhhhhhh January 2, 2019
Get the Retardedmug.