Top Definition
An industrial band from Canada. Also applied to Sonic the Hedgehog's rival Shadow, who is often referred to as 'The Ultimate Lifeform.
Sam was glaring at his computer with Ultimate Lifeform pounding in his ears, not hearing his mom yell at him to come down for dinner.


Shadow IS the Ultimate Lifeform!
by livebodybag September 06, 2008
6 Words related to Ultimate Lifeform

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