V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MOTSS
       More Of The Sameold Sameold (Usenet)


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

MOTSS
 /mots/, /M?O?T?S?S/, n.

    [from the 1970 U.S. census forms via Usenet] Member Of The Same Sex, esp.
    one considered as a possible sexual partner. The gay-issues newsgroup on
    Usenet is called soc.motss. See MOTOS and MOTAS, which derive from it.
    See also SO.