To go and do a poo.
After having a big feed of pancakes for breakfast, you may feel like you need to fart, only to realise that there is more to it than just wind. So, you can use this expression to politely excuse yourself from the room without having to go into details of your need for sudden releif..
"Excuse me, I have to do an early morning pancake fart."
by PepeFlara August 20, 2006
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