Top Definition
To play hardball means you are going to get really serious.

To not hold anything back. To go all-out.
That bastard hasn't paid me back the $100 he owes me. I'm gonna play hardball now.

I wouldn't mess with the principal if I were you. He knows how to play hardball.
by $@^!&$# September 01, 2008

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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