S/O definition by Slang.net
This page explains what the acronym "S/O" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Online auction and sales sites use the acronym S/O to mean "sold-out." For example, you may see S/O in eBay listings or on product pages in online stores.
Much less commonly, you may see other people use S/O to mean "sold-out" on forums or social media. When used this way, S/O may refer to a sold-out item or a person who "sold out," by betraying their principles.