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Hacking X for Y n. [ITS] Ritual phrasing of part of the information which ITS made publicly available about each user. This information (the INQUIR record) was a sort of form in which the user could fill out various fields. On display, two of these fields were always combined into a project description of the form "Hacking X for Y" (e.g., "Hacking perceptrons for Minsky"). This form of description became traditional and has since been carried over to other systems with more general facilities for self-advertisement (such as Unix plan files).
Hackintosh n. 1. An Apple Lisa that has been hacked into emulating a Macintosh (also called a 'Mac XL'). 2. A Macintosh assembled from parts theoretically belonging to different models in the line.
hackish /hak'ish/ adj. (also hackishness n.) 1. Said of something that is or involves a hack. 2. Of or pertaining to hackers or the hacker subculture. See also true-hacker.
hackishness n. The quality of being or involving a hack. This term is considered mildly silly. Syn. hackitude.
hackitude n. Syn. hackishness; this word is considered sillier.
hair n. [back-formation from hairy] The complications that make something hairy. "Decoding TECO commands requires a certain amount of hair." Often seen in the phrase infinite hair, which connotes extreme complexity. Also in hairiferous (tending to promote hair growth): "GNUMACS elisp encourages lusers to write complex editing modes." "Yeah, it's pretty hairiferous all right." (or just: ''Hair squared!")
hairball n. [Fidonet] A large batch of messages that a store-and-forward network is failing to forward when it should. Often used in the phrase "Fido coughed up a hairball today", meaning that the stuck messages have just come unstuck, producing a flood of mail where there had previously been drought.
hairy adj. 1. Annoyingly complicated. "DWIM is incredibly hairy." 2. Incomprehensible. "DWIM is incredibly hairy." 3. Of people, high-powered, authoritative, rare, expert, and/or incomprehensible. Hard to explain except in context: "He knows this hairy lawyer who says there's nothing to worry about." See also hirsute.
A well-known result in topology called the Brouwer Fixed-Point Theorem states that any continuous transformation of a surface into itself has at

 
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