I'm a web developer and I've often heard other technical and developer types say:
Sorry, I don't have the bandwidth to take on your project at this time.
I started using the term myself and thought it was an excellent way of expressing that you don't have enough time for something. Recently, I used this term with a potential client and he interpreted it as meaning that I still had a dialup internet connection so would not be able to handle his needs.
I then realized this is where the term originated from so I guess I could understand his confusion. Should I use the word only in specific circles of people that I know will understand it?