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When you have vigorous, testerone fueled sexual Intercourse with an individual wearing nothing but a flannel and a beanie. The tempo if said Intercourse is supposed to match that of the felling of 90 year old oak trees, when an orgasm is reached "timber" is usually groaned out.
I bought my boyfriend a flannel for Christmas and I've been getting lumberbacked ever since.
by Finalformkilo February 20, 2017
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