The Jargon File (version 4.4.7, 29 Dec 2003):

sneakernet
 /snee'ker?net/, n.

    Term used (generally with ironic intent) for transfer of electronic
    information by physically carrying tape, disks, or some other media from
    one machine to another. ?Never underestimate the bandwidth of a station
    wagon filled with magtape, or a 747 filled with CD-ROMs.? Also called
    ?Tennis-Net?, ?Armpit-Net?, ?Floppy-Net? or ?Shoenet?; in the 1990s, ?Nike
    network? after a well-known sneaker brand.


The Free On-line Dictionary of Computing (30 December 2018):

sneakernet
foot-net

   /snee'ker-net/ Term used (generally with ironic intent) for
   transfer of electronic information by physically carrying
   tape, disks, or other media from one machine to another.

   "Never underestimate the bandwidth of a station wagon filled
   with magtape, or a 747 filled with CD-ROMs."

   Also called tennis-net, armpit-net, floppy-net, shoe-net,
   walk-net, foot-net.

   (2003-07-02)