beaver head

This is when you have to shit so bad some of the shit is sticking out your ass, thus looking like a beaver head coming out.

I can't sit down right now I have a beaver head poking out.

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fat headed beaver

Is someone who has facial features that resemble a beaver, i.e. preferably buck teeth and beady eyes.
Oh yeah and has an abnormally large head.

Mate you need to sort out your image u look like a fat headed beaver.