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1.
A slang word for a wonder bra. This is because it looks big and impressive from the outside and will cost you a fortune to get inside it. But once you actually get inside nothing else awaits but disappointment!
Shes wearing a millenium dome.
Hey check out the MD over there
by J1mmy August 07, 2005
 
2.
In a nutshell a 'wonderbra'.
Looking from the outside everything looks big and exciting, much like the millenium dome.
But once inside you're massively disappointed, and soon realise that it's nothing you're going to be writing home to your mates about.
Bloke 1: Epic knockers!
Bloke 2: it's a farce, they're millenium domes.
by Jaques le'cube March 06, 2008
 
3.
Tits that look good from the outside, turn out to be nothing but fried eggs underneath the push up bra.
Check out the millenium domes on her.
by Garth August 04, 2004