I’m going with this one: Batman blows Robin on yon Gotham bridge; Vows Gordon’s next.

But wiki has a list:

https://en.wikipedia.org/wiki/List_of_electronic_color_code_mnemonics#Offensive/outdated

Looks like it’s mostly in ROY G BIV order, although you’ve got black and brown up front, then they drop indigo and add gray and white at the end.