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.