luxurious indulgence, usually by a female, in a plentiful supply of semen. Her body is usually naked - as "bath" would suggest - both for practical and sensual reasons. For reasons of the standard male performance (5-12 cc of fresh ejaculate), more than one man is likely to be called on to turn on the supply for her. The alternative - pre-packaged sperm from one or more sources - is rather too gruesome to contemplate. And a girl can get mighty cold and bored waiting around in her birthday suit for a fully satisfactory coverage of her bathing needs by any one man's repeated creative outputs.
Cumbaths are by nature often more easily come by in porno - with the help of fluid supplements and substitutes, and a few sleights of hand - than in the hard light of workable reality.
The worst level of humanity you can think of. If you are classified as a "cumbath," then don't expect to find a high paying job, an attractive wife, or any amount of happiness in your life. Your only hope is to be covered in the wonderful biological man-substance known as "cum." You'll be poor and probably sell pencils in a little tin cup, but you will be always warm due to the eternal baths of creamy ball butter that is expunged upon your corpulence. Enjoy it, you douchebag, or should I say, "cumbath."
God dammit, Subin and Screech are such monstrous cumbaths. They just watch Seinfeld and eat Japanese food. Bunch of cumbaths!!"