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Derived from the word "Excuse".It is tendency/Disease/Regular behaviour of making excuse for every poor performance.In simpler words,giving excuses for everything and trying to back their faults
person 1:-Your calculation seems wrong
person 2:-i guess the calculator isnt working right

person1:-your handwriting is ridiculous
person2:-i think the pencil isnt dark enough
person1:-dude,you are EXCUSITIS
by anotherJustanotherguy October 12, 2009
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