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Putting up a K. AKA putting up 1000 dollars in the bank.
A K means Kilo which means 1000. "Kilometer, Kilobyte"

In baseball when a person is struck out, the pitcher will receive a 'K' in the score books. They will also put up the letter 'K' on a sign usually in the outfield.

If you strike out your bank account you have put up a K which means putting 1000 dollars in your account.
Man: Man you've been working a lot.
Man2: I know but I just struck out the bank account again.
Man: I hear that, another $1000.
by SFB aka the hardcourt killa June 27, 2010