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When you are being masturbated by a partner, and said parter shoves a travel sized bottle of head and shoulders up your ass. Typically done in the backseat of a car in the middle of the day.
Guy 1: Man, Laura invited me to a Head & Shoulders Party last weekend. It was awesome! We had it right in front oh her church!
Guy 2: Ew.
by M.J.R.T. October 16, 2006
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