One who believes in the theory of flat earths, perhaps as a result of having either a flat head or flat testicles.
Two flat-earther astronauts go into space.
"Look dude, we're orbiting a blue pancake!"
"Holy fuck! That's a funny ball-shaped pancake!"
"Look dude, we're orbiting a blue pancake!"
"Holy fuck! That's a funny ball-shaped pancake!"
by masterblaster01 January 17, 2018

One who lacks the most important organ, a brain. One who believes that the Earth is Flat, and that space doesn't exist and is just a 'dome' around the Earth and everything is a lie told by the government.
Guy 1: How do u feel about Flat Earthers?
Guy 2: I feel that all Flat Earthers should be sent up in a rocket, and ejected into space, so their last sight will be a Spherical Earth in Space.
Guy 2: I feel that all Flat Earthers should be sent up in a rocket, and ejected into space, so their last sight will be a Spherical Earth in Space.
by Sur7 January 25, 2019

All flat earthers are dickheads.
by FrogBoot May 05, 2018

by Skin Ne Penis February 22, 2018

Someone who not only believes the Earth is flat, but will also claim any argument against their theory is government propaganda.
I hear Bob is a Flat Earther. We should send Bob up into space so he can get a harsh dose of reality.
by Gatch Attack July 22, 2017

Hey, welcome to the Flat Earthers club take a seat and our international meeting with start in 5 minutes so get prepared to lose more brain cells than you currently have
by The Urban Dictionarian July 07, 2018

Flat Earthers are mentally retarted
by Eazy-E Jr. October 17, 2018
