A maneuver employed during urination when one realizes, in midstream, that a bowel movement is also needed. The first pinch of the penis cuts off the flow while the pants are unbuckled and dropped to the floor. The second, or the “handoff” pinch occurs after reaching inside the briefs with the opposite hand to continue the pinch, so the briefs can be lowered without incident and a commode employed without delay.
Todd: “Damn!”
Paul (pissing at the adjacent urinal): “What’s the matter?

Todd: “I gotta take a shit right now!”
Paul: Do a Double Pinch. The stall’s empty behind us!”
by OneStarGator November 6, 2017
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