Top Definition
When you wear extremely tight panties that everyone can see through your pants, even from the top row of the balcony in an auditorium. It gives the effect of having four butt cheeks side by side.
"Do I have a Blanshan Butt?"
"Yes, change your panties, you idiot! You look like you're wearing panties for toddlers!"
by renaelocksley August 15, 2011

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