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A gallybagger is someone so hideous they look like they were hit by a truck and then stepped on by a donkey. You'd rather fight a dragon than look at them.
My cousin is a gallybagger. He has a face like a rotten potato.
That girl in my math class is a gallybagger. She looks like she came out of a sewer.
My teacher called my friend a gallybagger after he wore socks with sandals.