1. (Mong)- Slang for spastic, but used against a person who says or does something completely idiotic by accident or without realisation. This makes every witness simultaneously raise their hands to their shoulders and shake 'em while sticking their tongue in their lower lip and making 'urrgh' noises.
2. (Monged)- A vegetive state of mind/being usually effective after consuming large quantities of alcohol, weed, lsd, ecstacy etc or combinations of.
1. Steve you mong, you've just poured the kettle onto ya cornflakes.
2. Steve's well monged after we spiked his drink with acid, muhahahaha.