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1. (n) A sample of human excrement which is so large in physical volume that a sense of alarm is immediately raised as it is commonly mistaken to be the size of the now extinct animal, Elephas americanus; colloquially referred to as the "Mastodon" 2. (n) A shit so absolutely anus-tearingly huge that you'd fucking think it's a real life mastodon erupting from your rectum.
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