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A Gnoble is an unidentified life form that can change into anything and anyone and it is impossible to determine if something is a Gnoble but much easier to determine if someone is a Gnoble by noticing them eating plastic which they don't do very often.

They make a strange noise before killing and can only me killed by being urinated on by male human beings.
Person 1: "Yo Jake is acting weird"
Person 2: "What makes you think that"
Person 1: "He just ate my water bottle"
Person 2: "He must be a Gnoble, don't touch him unless you want Herpes"
by Mike Coffin May 25, 2017
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