The muck that forms on subway floors when it's raining.
Without thinking, I set my bag down on the way to work, and now it and I are both covered in umbrella gravy.
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umbrella gravy
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Inferring the quality of an ass viewed only from the front. An inexact science.
"It was like she was hiding it, but eventually I got a glimpse of her ass. It was luscious. My reverse psychology was dead on."
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Reverse Psychology
mug!