i could eat a nun's arse through a convent gate

Indication of being very hungry indeed.

'I'm so hungry, I could eat a nun's arse through a convent gate.'

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i could eat the north end of a skunk moving south

An expression of extreme hunger. Common in rural Wyoming and Colorado, USA

"Man, I'm so hungry I could eat the north end of a skunk moving south."

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I could eat the crutch off a low flying duck

To be so hungry that if a duck were to fly over you quite close to your head you would reach up and take a bite of the duck's crutch in order to ease your hunger pains.

Man I'm so hungry I could eat the crutch off a low flying duck!

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