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Bottomelon is when a girl is wearing a thong in a skirt that sometimes rides up showing the bottom part of her butt cheeks. This makes her butt look like two melons are hanging out from her skirt.

(helps if your buts not a pancake)
Hey bro look at that chicks skirt. She's got a ripe bottomelon!
by Cuev March 28, 2010
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