1. ("Cap'n Crunch") An early 1970s hacker/phreaker/phacker who used a free whistle included with "Cap'n Crunch" breakfast cereal to fake pay phone system tones and make large quantities of free phone calls. Also alludes to "crunch".

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2. (After the above) wardialer.

3. Reportedly, a program which crashes a computer by overloading the interrupt stack.