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Someone who makes an ass of themselves, whether being used to describe a short instance or someone's permanent persona.
Generally ..
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A pseudonym for the Common Badger (Meles meles). "strange individual" i.e. not what one was expecting
See also Alan Sheareran..
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When you get carried away with nail biting and you gnaw down so far that it makes your fingers hurt. Only leaving a little nub for finge..