n. 1. Used by hackers in a generalization of its technical meaning as the volume of information per unit time that a computer, person, or transmission medium can handle.
"Those are amazing graphics, but I missed some of the detail -- not enough bandwidth, I guess."
2. Attention span.
3. On USENET, a measure of network capacity that is often wasted by people complaining about how items posted by others are a waste of bandwidth.