Atard

1. A person who creates the illusion of being clever but is actually full of shit; an idiot disguised as an intellect
2. Someone who gets As in school but lacks common sense or is unbelievably slow in other matters
3. Euphemism for calling someone a retard; someone who clearly isn't retarded but also clearly not of normal intelligence

Mel: I did not believe in atards until I met Jennifer
Joe: Yeah, I see what you mean...

*2 minutes until submission time*
Christina: OMG it won't let me upload the assignment !!!
Kate: How about closing the file first, you atard
Christina: Phew

"Anti-vaxxers are all atards"