Meaning : In accord with the most fashionable ideas or style.
Example :
Wears only the latest style.
The last thing in swimwear.
Cutting-edge technology.
A with-it boutique.
Synonyms : cutting-edge, up to date, up-to-date
Meaning : Having the shrewd resourcefulness needed to survive in an urban environment.
Synonyms : street smart, streetwise
With-it meaning in Bengali (Bangla).