How is “muck about” used?

In The Selfish Giant (2013), one line is: “- Hurry up and stop mucking about.”

Which movie is “muck about” from?

The clip at the top of this page is from The Selfish Giant (2013).

to behave in a silly way, especially when you should be working or doing sth else

informal · British · Heard in 4 movies

Oxford100% of films
to behave in a silly way, especially when you should be working or doing sth else
Don't muck about with it, for Christ sake. You've been pulling that bleeding knob.

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

- Hurry up and stop mucking about.

Said in 8 films · #1