A four-foot bong. What's that?

A bong is a device for smoking marijuana. Twenty gallon lungs is not a common construction, the author has made it up to suggest that the swimmer had a very large capacity in her (?) lungs, and could therefore take in very large quantities of the marijuana smoke from the bong.



This is what the device looks like--i couldn't quickly find an image that looked as though it were four feet long, but bongs of that size are not uncommon.

A bong is an opened glass tubular pipe used to smoke marijuana.
http://en.wikipedia.org/wiki/Bong

Yes.

http://onelook.com/?w=bong&ls=a

I think that the '20 gallon lungs' makes reference to a humongous set of breasts/tits/schmeebs/boulders/bazooms/Pointer-Sisters/... .

Note the word 'gorgeous'.

I was described as gorgeous once, back in the day, and do not have breasts. Neither am I a female.

Just think what you might have been described as, Infra, had you had breasts.

I only offer the suggestion that the 20 gallon lungs on the female swimmer referred to breast size. Speaking of breasts as if they were lungs is not unheard of.

"Hermaphrodite" comes to mind.