Game Show Network is an American basic cable channel that is owned by Sony Pictures Television. GSN is short for Gay Sex Now. Slang / Jargon (2) Acronym. Looking for the definition of GSN? Find out what is the full meaning of GSN on Abbreviations. GSN may refer to: Game Show Network, an American television channel; Gay Star News, a British news website; Gelsolin · Gigabyte System Network,. This page is all about the meaning, abbreviation and acronym of GSN explaining the definition or meaning and giving useful information of similar terms.