How about them apples?

Meaning

A casual rhetorical question used to express surprise or to point out an unexpected outcome. It is often said with a smirk when someone successfully pulls off a difficult task or makes a point.

Playful, smug

Used in a sentence

• I managed to fix the sink without calling a plumber, how about them apples?
• We got the project finished two days early, how about them apples?
• The team scored in the final minute, how about them apples?