Navy shower
n.— «Take a “Navy” shower (turn the water off while you lather); save 8 gallons.» —“10 tips to save water” by Bo Emerson Atlanta Journal-Constitution (Georgia) Oct. 25, 2007. (source: Double-Tongued Dictionary)
Further reading
A retronym is a word coined to distinguish something new from an older, more generic version, such as electric guitar or clock radio. A couple of new retronyms are fine water, or “unprocessed water that reflects a region’s terroir” and water...
When there’s no evening meal planned at home, what do you call that scramble to cobble together your own dinner? Some people apply acronyms like YOYO — “you’re on your own” — or CORN, for “Clean Out your Refrigerator...