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D. u. b. s. is when you hide your hard-on with your belt. It’s like a secret mission for guys who don’t want anyone to know they’re getting a boner in math class.
I was doing D. u. b. s. so hard, my belt was about to break.
He did D. u. b. s. so well, I didn’t even notice he had a boner.
My D. u. b. s. failed because I laughed too loud during the test.