FWIW I did

    grep -riE '(5|s)(c|k)r?(i|1)(p)(t|7)( ?)(k)(1|i)(d{2,3})(y?|(i|1)?(e)?)' ./b/tmp/utzoo-wiseman-usenet-archive/

and got no hits (your original hits lots of usage of "skidding"). Source of that archive is archive.org - https://archive.org/details/utzoo-wiseman-usenet-archive.

There are a lot of hits on "kiddies" in comp usenet groups. For example:

    From: SYSMSH@ULKYVX.BITNET.UUCP
    Newsgroups: mod.computers.vax
    Subject: how to stomp on your kiddies
    Message-ID: <8605210414.AA16691@ucbvax.Berkeley.EDU>
    Date: Thu, 15-May-86 16:48:00 EDT

but not "script kiddies". I think it's just used as a general term for uninitiated or novice computer users, especially from a sysadm persepective.

Thank you for reminding me how much I hate regex