1)A sexual position to which the female would hang spread out on the ceiling tied upside down while the male would get head while spitting on the vagina.
2)Chuck Norris' penis.
-Hey lets try out the Girder baby.
-Look at that girder!
by Girder May 01, 2008
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1.a term used when a person is refering to something technical about which he has no real knowlege.
2.often used in a response to the question "What were you doing?"

Originally used in the movie "Tommy Boy" with Chris Farley.
1.Q:"Hey, do you know what's wrong with my computer?"
A:Yeah just a second I think there may be a problem with the rotary girder.
2.Q:"Dude, what the hell are you doing?"
A: Sorry, I was just checking the specs on the rotary girder.
by KoolAid March 10, 2004
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A shit that won’t flush and sits at the bottom of the toilet slowly dissolving.
Hey Mike you know that shit I had this morning, well it just refuses to flush and it just sits there looking more and more like a rusty girder
by Chivchovs October 25, 2017
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A child who was conceived by, on top of, or around girders of the square variety.
Your child, good sir, is in fact a girder baby.
by Jeremy Hubbard January 11, 2012
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