Из бусурманской
Википедии =>
United Kingdom£1,000 is commonly referred to as a grand, e.g., £4,000 would be called 4 grand, or rarely in certain dialects as a "bag" (from the rhyming slang "Bag of Sand"), e.g., £4,000 would be called 4 bags.
United StatesAmounts above 1000 US dollars are occasionally referred to as "large" ("twenty large" being $20,000, etc.). In slang, a thousand dollars may also be referred to as a "grand" or "G", "K" (as in kilo), or less commonly a "stack", a "bozo", as well as a "band" . For example, "The repairs to my car cost me a couple grand" or "The repairs to my car cost me a couple [of] stacks".
Так что на штатовском сленге это тысячи долларов, на британском это тысячи фунтов стерлингов.
На русский эти
grand переводятся как
штуки - так на нашем сленге.