Bojack is slang where I live in the uk for cheap products. Mainly used in reference to things like alcohol. You get Grey Goose Vodka, Russian Standard Vodka and Smirnoff Vodka but if you bought a supermarket own brand vodka it would be referred to as bojack ie cheap vodka and nothing special.
I don’t know if it’s uk wide slang or local slang.
Spell Checker Blues
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Weather eye am wrong oar write
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Anon