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Head Loss is defined as: 1. To move a given volume of liquid through a pipe requires a certain amount of energy. An energy or pressure difference must exist to cause the liquid to move. A portion of that energy is lost to the resistance to flow. This resistance to flow is called head loss due to friction. OR 2. When she doesn't finish sucking on yo dick when she be giving you a blowjob so now you have blue balls which sucks.
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