Your partners pubic hair when you’re performing oral.
My hygienist asked the secret to my healthy gums - “‘My husband has the best devil’s dental floss .”
by Angry Scientist October 21, 2017
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Somehow receiving red pubic hair in one's mouth. Often this would occur during oral sex.
From one woman to another. "When I was drunk I went down on this redheaded guy. I stopped and pulled a long fire-y out of my mouth. He laughed and said 'Got ya some of my devil's floss did you?' I looked at him and said 'yes! Why does it taste like peanut butter?'"
by zjme October 19, 2009
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