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1. To serve food at a diner or cheap restaurant. ("Hash," in this sense, refers to a dish or stew of chopped meat and vegetables.) I spent five years slinging hash for 60 hours a week to pay my way through college.
2. To sell hashish. (Hashish, shortened as "hash," is the resin from cannabis plants prepared to be smoked, chewed, or ingested.) I used to sling hash during my college days, but too many of my friends got locked up for it, so I got out of the game.
Serve food in a restaurant, especially a cheap establishment. For example, The only job she could find was slinging hash in the neighborhood diner. This term alludes to the inelegant presentation and nature of the food, in effect, tossing hash before a customer. [Slang; mid-1800s]