These words arrived in the OED in September 2016:
leetspeak, n.
Forms: 19– leetspeak, 19– 133t5p34k, 20– l33tsp33k, 20– l33tsp34k,
20– 133tsp33k, 20– 133tsp34k, 20– 133t5p33k, 20– 13375p34k.
Etymology: < leet adj. + -speak suffix.
In forms including numerals, 1 represents the letter l (owing to the
visual resemblance of the numeral to the lower-case letter), and 3,
7, 5, and 4 represent the letters E, T, S, and A respectively (owing
to the visual resemblance of these numerals to the upper-case forms
of these letters), according to the conventions of this system of
spelling.
An informal language or code used on the Internet, characterized by
its distinctive vocabulary and by a nonstandard system of spelling
in which all or some of the standard letters are replaced by
numerals, special characters, or other letters.
Originally associated with the subculture of computer hackers.
1999 Lingo used by Chatroom W*nkers in alt.geek (Usenet newsgroup)
19 Dec. I'd guess that 133t5p34k (leetspeak as it is called..)
probably started as a way to avoid moderation on usenet.
2003 Times (Nexis) 4 Feb. 16 ‘Hacker’ may be written ‘H4x0r’ and
the slang described as ‘133t5p34k’.
2011 B. Melançon et al. Definitive Guide Drupal 7 ix. 200,
13375p34k..[is] obnoxious to some and completely incomprehensible
to others.
2015 A. Coxhead & J. Bytheway in D. Nunan & J. C. Richards Lang.
Learning Beyond Classroom vii. 69 The acceptance of flexible
spelling is part of leetspeak and encourages creativity.
leet, adj. and n.5
Forms: 19– leet, 19– 133t, 19– 1337, 19– l33t, 19– l337.
Etymology: Representing the pronunciation of the second syllable
élite n.3
A. adj.
U.S. colloq. Of a person: skilled at computer programming or
hacking. Also as a general term of approval: masterful; ‘awesome’.
[1992 Gleanings (58) in bit.listserv.words-l (Usenet newsgroup)
7 Sept. C00l and EleEt are the words ‘cool’ and ‘elite’ spelled
in the currently preferred style of the 17-year-old self-styled
hacker. I was using those spellings to some now-forgotten humorous
effect.]
1995 McGill Dialup Softwares in mcgill.general (Usenet newsgroup)
8 Nov. Itz kewl, dude. You should check it out coz itz just for
the 'leet windoze userz.
1996 comp.sys.mac.programmer.games (Usenet newsgroup) 11 Jan.
(title of posting) leet GAME PROGRAmmers NEEDED!
2001 Austral. & Refugees in alt.games.starcraft (Usenet newsgroup)
1 Sept. Thank you Chas, that was 1337.
2006 C. K. Sample PSP Hacks ii. 89 As for you 1337 hackers who
scoff at how basic this hack is, consider it a challenge.
2013 C. Doctorow Homeland 343 If you guys are all so leet and
badass, why don't you do this?
B. n.5
....
2001 Any l33t Experts? in alt.games.half-life.counterstrike
(Usenet newsgroup) 5 Mar. l33t is hacker speak, Hackers use that
talk to talk without having written evidence.
2009 Canberra Times (Nexis) 21 Feb. a12 Don't be surprised if
you find yourself emailing in l33t afterwards.
2015 S. Baldwin Internet Unconscious ii. 32 A common use of leet
is for undesirable or illegal communication.
pwn, v.
Etymology: Alteration of own v., perhaps originating in a typing
error (the letters o and p being adjacent on a standard computer
keyboard).
colloq. (chiefly U.S.).
trans. To inflict a humiliating defeat on (an opponent), esp. in an
online game. Also: to gain unauthorized access to or compromise (a
computer, network, etc.). Cf. own v. 8.
The unusual spelling and syntax of quot. 2002 reflects the use
of leet code: see leetspeak n.
2002 AGD vs. AGD2 in alt.games.diablo (Usenet newsgroup) 18 Feb.
WE 1337 WE PWNS J00!!!
2007 Wired Apr. 109/2 Mad Catz Xbox 360 Arcade GameStick...
Three turbo settings let you impress and ‘pwn’ friends.
2008 Network World (Nexis) 26 Feb. 12 Are you saying that you
can pwn a network with ANY version of VNC installed on the
systems?
2011 Men's Health (U.K. ed.) (Nexis) July 19 We show you what
happened when our writers challenged athletes..to work out with
them. They got pwned obviously.
2013 C. Doctorow Homeland xiv. 343 You'd be amazed at how many
other peoples' computers we've pwned.
--
Peter Duncanson, UK
(in alt.usage.english)