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nutbar
someone who is hilariously crazy. An amalgam of the word 'nut' and the acronym 'beyond all recognition': How was it when Roland ran around tieing people up with his underpants? He's a complete nutbar!
Contributor's comments: It appears the terms 'nutbar' and 'nutbag' are very similar. Whether in a bar form or in a bag the person whom this term of endearment is applied to is some kind of nut!