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Another name for a Romper, a garment commonly worn by human females. Rompers almost always leave 95% of the ass exposed. The view created by a romper mimics the function of a window, as you can clearly see the object inside but do not have access to it.
Guy1: "Bro, look at that girl! You can see 95% of her ass in that romper!"

Guy2: Yeah you can clearly see it through the ass window."
by TheCuzJim November 18, 2016
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A small hole in a pair of jeans that would reveal a portion a person's behind if they happen to be wearing a thong or possibly less.
Did you see the ass window on her?
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