Noun- A slang term used to define a guy gets a boner so hard to the point where his penis physically can not bend then you call it iron wood. A joke on the slang term for a penis, wood, further expressing how hard it us by adding the word iron to it.
Friend 1: Hey how'd it go last night with Sarah.
Friend 2: I wasn't expecting her to be hot, but when she stripped my dick turned straight into Ironwood and didn't go down for a couple hours.
Friend 1: Nice bro *High fives Friend 2*
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