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arena [Unix] n. The area of memory attached to a process by brk(2) and sbrk(2) and used by malloc(3) as dynamic storage. So named from a malloc: corrupt arena message emitted when some early versions detected an impossible value in the free block list. See overrun screw, aliasing bug, memory leak, memory smash, smash the stack.
arg /arg/ n. Abbreviation for 'argument' (to a function), used so often as to have become a new word (like 'piano' from 'pianoforte'). "The sine function takes 1 arg, but the arc-tangent function can take either 1 or 2 args." Compare param, parm, var.
ARMM n. [acronym, 'Automated Retroactive Minimal Moderation'] A Usenet robot created by Dick Depew of Munroe Falls, Ohio. ARMM was intended to automatically cancel posts from anonymous-posting sites. Unfortunately, the robot's recognizer for anonymous postings triggered on its own automatically-generated control messages! Transformed by this stroke of programming ineptitude into a monster of Frankensteinian proportions, it broke loose on the night of March 31, 1993 and proceeded to spam news.admin.policy with a recursive explosion of over 200 messages.
ARMM's bug produced a recursive cascade of messages each of which mechanically added text to the ID and Subject and some other headers of its parent. This produced a flood of messages in which each header took up several screens and each message ID and subject line got longer and longer and longer.
Reactions varied from amusement to outrage. The pathological messages crashed at least one mail system, and upset people paying line charges for their Usenet feeds. One poster described the ARMM debacle as "instant Usenet history" (also establishing the term despew), and it has since been widely cited as a cautionary example of the havoc the combination of good intentions and incompetence can wreak on a network. Compare Great Worm, the; sorcerer's apprentice mode. See also software laser, network meltdown.
armor-plated n. Syn. for bulletproof.
asbestos adj. Used as a modifier to anything intended to protect one from flames; also in other highly flame-suggestive usages. See, for example, asbestos longjohns and asbestos cork award.
asbestos cork award n. Once, long ago at MIT, there was a flamer so consistently obnoxious that another hacker designed, had made, and distributed posters announcing that said flamer had been nominated for the

 
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