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Much like the term "flow" which is popular in the lacrosse culture, butt flow is when a person has extremely long and ungroomed butt hair, or butt flow.
When Brad drunkenly got naked the whole party saw his butt flow.
At the soup kitchen the ugly woman bet over exposing her butt flow confirming our suspicions that she was a dude.
by pootermanbuffalo June 17, 2010
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