How is “muck in” used?

In Futurama: Into the Wild Green Yonder (2009), one line is: “The Martian muck leech.”

Which movie is “muck in” from?

The clip at the top of this page is from Futurama: Into the Wild Green Yonder (2009).

Phrasal verb

to work with other people in order to complete a task

Heard in 30 movies

1
to work with other people in order to complete a task
If we all muck in, we could have the job finished by the end of the week.
2
to share food, accommodation, etc. with other people
We didn't have much money, but everyone just mucked in together.

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

The Martian muck leech.

Said in 8 films · #1