When someone is incredibly dumb and talks or walks like they are on drugs/mentally retarded. hence mentally cunted.
Mate what are you doing, you're mentally cunted right now, go home!
by Nakutya December 12, 2015
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Someone who is completely off their rocker. " you seen Virgil these days?" Nah mate and seen in him in a while" the mental cunt was shouting a pigeons in town"
by Dougy beaver March 30, 2017
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A cunt who is mental or somebody who is doing something crazy or outlandish.
ROSS: Look at Chris he just squatched an entire bottle of tequila in one go!

PHIL : Fuckin' hell! He's a mental CUNT!

LEWIS : Ken.

TANK : YA FUCKIN' SHOWER OF MAD CUNTS!!!! SWATCH MA BOABY!!!
by phil accie 2k8 July 14, 2008
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