Definition of that's your or his, or her, etc. problem in English:

that's your (or his, or her, etc.) problem

(Said with emphatic stress on pronoun) used to express one’s lack of interest in or sympathy with the problems or misfortunes of another person: he’d made a mistake but that was his problem
More example sentences
  • How you cope with ordinary bookstores thereafter, well, that's your problem.
  • If you're getting fat from fast food, some politicians say that's your problem.
  • If you live overseas and can't figure out the time difference, that's your problem.
See parent entry: problem

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous