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

bytesexual
 /bi:t`sek'shu?@l/, adj.

    [rare] Said of hardware, denotes willingness to compute or pass data in
    either big-endian or little-endian format (depending, presumably, on a
    mode bit somewhere). See also NUXI problem.


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

bytesexual

    /bi:t" sek"shu-*l/ An adjective used to describe
   hardware, denotes willingness to compute or pass data in
   either big-endian or little-endian format (depending,
   presumably, on a mode bit somewhere).  See also NUXI
   problem.

   [Jargon File]

   (2009-05-28)