noun
worthless thing; trivial thing
Used in dismissive phrases like ...もへったくれもない to say something is not worth considering or there's no point in making distinctions. Often follows a noun or noun phrase.
理由もへったくれもない。とにかくダメなものはダメだ。
There's no point talking about reasons or anything. It's just not allowed, period.
忙しくて、
I'm so busy that there's no such thing as a day off or anything like that.