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An oaty dunker is when a guy gets lucky with a girl who just came from another guy’s messy mess, and now his meat is like a spoon in a bowl of old oatmeal.
My cousin got an oaty dunker after the girl said she had a 'crumbly creampie' from the guy next door.
He said he came in like a spoon and left like a soggy crumb.
My uncle’s oaty dunker was so bad, he had to eat cereal for a week.