This is the 7450th most frequent Russian word.
гущин
"Гущин" is a Russian surname and does not have a standalone meaning in English.
Гущин here is used as a brand name, likely of a product or entity.
Гущин - это новая конфетка на рынке.
Gushchin is a new candy on the market.
Гущин is used here to describe coffee grounds, a common context.
На дне чашки оставалась только кофейная гущин.
Only coffee grounds remained at the bottom of the cup.
Гущины as an adjective describes 'forests' as dense or thick, derived from 'гуща' for density.