to get tasks complete quickly.
to do anything quickly.
Boss: "Hey Danny, I noticed that you are getting a lot of work done."
Danny: "Yea, Boss. I have been pushing tin"

Drive A: "How did you get home so fast?"
Drive B: "I was pushing tin"
by Law_mountain March 14, 2008
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Suppose you are in a group of people where you typically do not offer your opinion on some choice, but actually have a preference. Those who actually have no preference use this expression to denote no opinion.

To express that you have no private preference.
A: Where do you want to eat dinner?
B: I'm pushing tin.
by tom June 6, 2004
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