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(Tee•en•ing) The act of using a reflective surface (i.e. a watch or a smartphone screen) to redirect a source of light into your friends eye whilst also simultaneously yelling "SOLAR FLARE". Also can be called Getting Tiened, Giving someone an ole Tien, or Solar Flaring
Guy 1: Hey dude, on the roadtrip I subjected Griffin to Tiening.

Guy 2: What's Tiening?

Guy 1: Take off your sunglasses and I'll show you.
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