What is Screaming Batman?
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To wait until one's friend falls asleep(preferably on the floor, passed out drinking, etc.), squatting over friend's face with pants down, butt cheeks on outside of friends face cheeks, and passing anal gas as intensely as possible so as to cause a cheek to cheek slapping effect.
"First one to fall asleep gets a screaming batman!"
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this is what the devil does on thursday afternoons
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