Means the person smokes marijuana (weed)
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The term 'yolo' in a microscope is when the 'hashtag 420' blazez into the cutforbeiber swag
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I'm unfamiliar with any specific or unique meaning of 420 in a mathematical context, but in the popular culture these days, 420 refers to marijuana usage.
The phrase 420 is a code-term used primarily in North America that refers to the consumptions of marijuana. It is a way to identify oneself with the marijuana subculture of marijuana itself.
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600/420 = 10/7
420 refers to weed most of the time people use 420 friendly meaning marijuana friendlyWeed friendly