So that skaters and skiers
Nose grinders and grinding up
Nose powders with ether
The non-drug related explanation
Keeping your nose to the grindstone is to work hard (put in work).
A ‘nosegrind’ is a specific skate trick, where you grind while balancing just on the front truck(set of wheels):
The drug related explanation
Keeping your nose to the grindstone is to work hard (put in work). i.e. deal drugs
Nose powder refers to Bolivian marching powder i.e. cocaine.
Skiers can be used to describe people who sniff cocaine. When someone says they’re “going skiing”, they are going to go sniff some cocaine (snow).
Ether is used in conjunction with ammonia on powder/crystallized cocaine to release/separate the cocaine base from the hydrochloride to create free-base cocaine which can then be smoked creating a quicker high. Baking soda is used similarly to make crack cocaine.
Ether which is used as a solvent and was once used as a general anaesthetic, can also be used to get high by itself.
Grinding up can refer to grinding a number of different types of drugs e.g. cannabis
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