I don't use colloquial terms for body parts in general, and breasts in particular. Maybe it's how I was brought up.
But, as they say on Airplane!, that's not important right now. What is important is that we've yet to defeat breast cancer, and so I urge you to participate in Second Life's Second Annual Boobie Ball. I'm sorry to say that RL events make it unlikely that I can attend (darn it; I could wear that Cretan outfit outside the Minoan Empire!), but the Balls are but a part of the 2009 Blogger Boobie-Thon.
For still more info, take a look at this entry (among others) on Eva Bellambi's blog, The Realm of the Red Rose.