1 definition by Thereare4lights

Top Definition
When you approach a girl from the back and she looks hot, but when you finally see her from the front, you notice that she is not good looking for some reason (butter face, acne problems, no breasts).
That girl I thought was banging from the back, but her face was gross and I lost all interest. She was a back siren for sure
by Thereare4lights March 07, 2012

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