Originated in the north east of england. Refers to your arsehole just after you've taken a shit and there are bits of poo stuck onto it that need wiping off.
I've just taken a shit and I've got a proper gammy eye. This sucker is gonna take ages to wipe!
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Covering up that you're playing call of duty by saying you have 'gammy eye disease'
bobby isnt here because he said he has gammy eye disease
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