Neal Boortz uses the term "fun bags" in this sentence:
It looks like Al Gore has indoctrinated some blonde bimbos. These rocket scientists are now strutting their fun bags and spewing global warming dogma at the Miss Earth beauty pageant."Fun bags"?
If I make the correct inference, "fun bags" means "breasts" and I have a new term for my lexicon.
A paraphrased exchange from The Sure Thing seems appropriate here:
"Do you think they'll know that 'fun bags' means 'tits'? I dunno, it doesn't sound specific enough."
"Where else will you find 'fun bags'?"