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A person with a butt that wiggles like a pudding when they walk and they usually eat too much and don't exercise.
My aunt is a nalgas de flan. She wiggles when she walks and eats three pies for breakfast.
That guy at the gym is a nalgas de flan. He can't even do 10 squats.
My dog is a nalgas de flan. He wiggles so much when he runs, it looks like he's trying to escape a pie factory.