How is “split on” used?

In Ambulance (2022), one line is: “Split, split, split, split.”

Which movie is “split on” from?

The clip at the top of this page is from Ambulance (2022).

Phrasal verb

to tell sb in authority about sth wrong, dishonest, etc. that sb else has done

informal · British · Heard in 253 movies

split on sb (to sb)
to tell sb in authority about sth wrong, dishonest, etc. that sb else has done
Don't worry — he won't split on us.

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

Split, split, split, split.

Said in 8 films · #1