What does "shake off the red" mean? This is not a use of slang I'm famliar with.

Student or Learner
Hi.
I'm writing a story about a criminal guy, and my intention is to use he's oral slang. My ideia is to say : " Find a way, how to sell the gold"
"Find out, where is it possible to shake off the red!"
Can I use this expression, or is it just wrong?
What does "shake off the red" mean? This is not a use of slang I'm famliar with.
"Find out, where is it possible to shake off the red!"
Find out where we can unload the gold!
I've never heard of gold as being "red". To fence the gold would work.
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