What does Dah lah kau popular mean in English?

It most likely means “already enough” / “that’s enough” / “stop it” in English, depending on context.

Meaning

• Dah lah is a colloquial Malay/Indonesian expression.
• It can sound like “enough already” , “just stop” , or “never mind” when someone is ending a topic.

• In some contexts, dah lah can also mean “not only” or “and on top of that”.

About “kau popular”

• Kau means “you” in informal Malay/Indonesian.
• Popular is the same as “popular” in English.
• So the full phrase “Dah lah kau popular” is likely something like:
  • “You’re already popular, enough.”
  • “Stop it, you’re popular enough.”
  • Or, if used sarcastically, “Oh, you’re so popular, huh.”

Best translation

A natural English equivalent is usually:

“Enough already, you’re popular.”

If you want, I can also give a more literal translation and a more natural slang translation side by side.