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1.
1) Lifting freeweights, origianally all made of cast iron. Some are now plastic.

2) Arnold movie about the first definition.
"Can't go out tonight, I'll be pumping iron at home."


"Have you ever seen pumping iron?"
by Gumba Gumba April 14, 2004
149 35
 
2.
To have brutal sex with the opposite gender.
"I can't picture you pumping iron with a man."
by CMarieT March 09, 2009
19 80