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1. Birdcage
A Birdcage is when a guy's ribs protrude farther than his chest. It is a word that is used to joke around with someone with a small weak chest.
Hey pal, Nice birdcage!
2. birdcage
Term used to describe someone with a protruding sternum and a skeletal body type.

See also:
ashtray; carcass;
What's the matter with you birdcage?
by Brad Feb 26, 2004 add a video
3. Birdcage
When your girlfriend owns the key to the cage that your dick lives in.
Help, I'm stuck in here. Let me out.

SOLID STEEL BIRDCAGE
4. Birdcage
The birdcage is when a guy has plans to chill with his friends but is then made to feel guilty to hang out with his woman.

Birdcage can also generally be a demanding girlfriend.
"Man, you coming out tonight?"
"Yeah, I'll be there..." --- phone rings---- "GOD DAMN BIRD CAGE!!!!!"

"What's Mike been up to recently?"
"I dunno, since his wings were clipped marriage he's really been birdcaged."
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