可不是

kěbushì
(coll.) exactly!; indeed; that's for sure

CEDICT

colloquial

Entry Composition

1 可不 kěbu see 可不是 kěbushì
=2 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=2 是 shì variant of 是 shì