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1.
1. The hexadecimal word-fill pattern for freshly allocated memory under a number of IBM environments, including the RS/6000. Some modern debugging tools deliberately fill freed memory with this value.

2. Geek-speak for dead/gone/erased/eliminated/removed
“Your program is 0xDEADBEEF”
(meaning gone, aborted, flushed from memory)
by Damian McMillan May 12, 2006
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