How is “not mess around” used?

In August Rush (2007), one line is: “We still mess around...”

Which movie is “not mess around” from?

The clip at the top of this page is from August Rush (2007).

Idiom

to do sth quickly, efficiently or in the right way

informal · Heard in 53 movies

to do sth quickly, efficiently or in the right way
When they decide to have a party they don't mess around.

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

We still mess around...

Said in 8 films · #1