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1. noun Clothing, especially a vest or jacket, made from highly reflective materials or containing bright, vivid colors. A variant of "hi(gh) vis," itself a shortening of "high visibility (clothing)." Sometimes hyphenated. Primarily heard in UK, Ireland. There are no street lamps along that road, so I always carry a torch and wear my hi viz when I go walking along it at night. Take a couple high-vizes with you and make sure everyone on the crew is wearing one.
2. adjective Of, containing, or made of such highly visible materials or colors. Usually hyphenated and used before a noun. Primarily heard in UK, Ireland. Please make sure you wear your high-viz vest when you ride your bicycle in the dark! All workers are required to wear hi-viz helmets and jackets while on site.
See also: viz
n. Levis; blue jeans. Those viz are too tight for her.