Someone who is real good at pointing out the obvious. Usually the idiot of the group who is trying to sound smart.
"Check out the grass, ITS GREEN!!"

"wow, you're a real mental giant aren't you"
by BVWhiTeBoY May 7, 2009
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The opposite of a mental midget, someone who is a 9 foot tall ogre in their mind, even if they're five foot nothing.
Guy 1- Why is he/she always slouching like that?
Guy 2-He/she is a mental giant, slouching makes him her look a little bit more predatory and a little bit less silly, so nobody will mess with him/her. It's kind of like the way some people get a tattoo so nobody will mess with them.

Guy 1- Oh yea, why didnt I think of that?
by Solid Mantis June 2, 2020
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The opposite of a mental midget, someone who is a 9 foot tall ogre in their mind, even if they're five foot nothing.
Guy 1- Why is he/she always slouching like that?
Guy 2-He/she is a mental giant, slouching makes him her look a little bit more predatory and a little bit less silly, so nobody will mess with him/her.

Guy 1- Oh yea, why didnt I think of that?
by Solid Mantis June 2, 2020
Get the Mental giant mug.