Worlds Biggest idiot 

Donald trump - Widely regarded as the worlds biggest idiot.
In fact a google search of the world idiot returns images of Donald trump.

“Oh look Donald trump has tweeted again, he really is the worlds biggest idiot”

Worlds Biggest idiot by Icantthinkofanythinggood December 12, 2018

gym idiot

Gym member (or more likely someone on free trial) who is more concerned with satisfying his (sometimes her) ego than doing any serious excercise. Will show off by spending ten minutes setting up the heaviest bench-press he can manage only to do one poor-ass set of three reps. Will vie for attention by constantly complaining that the equipment is too easy, despite the fact he is simply doing two a minute on the heaviest setting for a machine.

Damn, another poser gym idiot.

gym idiot by Gumba Gumba February 23, 2004

smart idiot 

Someone who is smart in school, but is dumb in almost all real life situations.

John got an A+ on his math test, later, he bragged about his new iPhone 5S and left his locker unlocked, and it got stolen. what a smart idiot.

smart idiot by ka6802 November 2, 2013

Orange Idiot 

The president of spray tans and a part time U.S leader

Hey did you hear Orange Idiot deleted his Twitter account

Orange Idiot by FRads February 5, 2017

blithering idiot 

Someone highly unsensible. A highly annoying person. A babbling idiot.

You're a blithering idiot

blithering idiot by Catwisperer November 26, 2016

your an idiot

a response that
1) makes one chuckle
2) proves that you didn't have a good English teacher
3) is said by true idiots
4) is now in Urban Dictionary

Johnny: 1+1=2
Dave: No it doesn't, STFU!
Johnny: I'm right!
Dave: Wow, your an idiot!

your an idiot by CChac May 10, 2008

Blooming Idiot 

A person that takes being an Idiot to a higher level.

My Boss is a Blooming Idiot.

Blooming Idiot by James November 9, 2004