This is a nonstandard, incorrectly spaced form of “das ist ja, ” meaning “that’s really, ” “that’s indeed, ” or “why
→ das
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This is a nonstandard, incorrectly spaced form of “das ist ja,” meaning “that’s really,” “that’s indeed,” or “why, that’s.”In standard German, write “das ist ja” as three separate words. The form “istja” is generally a typo or informal omission of the space.