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A poo that is so hefty and enormous that instead of taking just one flush to go down, it takes thirteen. Often beige in colour and may resemble a corn-on-the-cob in size and shape. Generally caused by being vegetarian.
Rob: Calum, why is there a corn-on-the-cob down our toilet?

Calum: That's not a corn-on-the-cob, it's a 13-flusher I just produced. Let me go and find something to break it apart with so it doesn't clog our toilet.
by Jizzletits December 09, 2010