"heck-care" is a phrase with a similar meaning to "heck if I care" but with a slightly more flexible syntactical role. It is possibly derived from such phrases as "heck if I care" (See also: wordsense-dot-eu/heck-care/). It is used by some Singlish speakers. The phrase is often part of an informal tone/register. Depending on the context and inflection, it may be received with either understanding or offense.

P.S.: It is possible that "heck" is mistranscribed as "hack" in the UrbanDictionary definition for "Hack Care", or vice versa. This article(answers-dot-com/english-language-arts/What_is_heck_care) claims the phrase to have the opposite meaning than that described here which does not comport with my personal experience.
James: "Oh shit, I never return back Ben's pen he lend me."
Janice: "He heck-care, lah." ("Ben won't be upset")

Alternatively, Janice: "Heck-care, lah." ("Don't worry about it"/"It is of little concern")
James: "Oh yeah, hor; Ben very heck-care in general, right?" (Here, Ben isn't too anal about things, rather maybe too relaxed)
by AzureArmageddon December 26, 2022
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