The base sentence is from an old film called "Perfect Crimes." Based on the context, I think "two grands of green" refer to "two grands of green back."
Saying 'two grand' to mean 'two thousand dollars' would be a typical usage. Adding 's' to 'grand' would normally sound odd to my ear. However, the addition of "One for you and one for me" does help justify it.
I'd say the addition of 'of green' is a whimsical addition to the usual expression, and 'gre
I'm not very sure if it's grands or grand because sometimes there are a few typoes in the subtite. Thank you for mentioning that. Speaking of which, I wonder why it's "two grand" instead of "two grands." Shouldn't we use the plural form?