Top Definition
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
Having vaginal intercourse with a menstruating female.
"I had to change my sheets because I was pumping iron with Sara last night"
by Quawmfpt January 07, 2015
To have brutal sex with the opposite gender.
"I can't picture you pumping iron with a man."
by CMarieT March 09, 2009

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