STS
STS definition by Slang.net
This page explains what the acronym "STS" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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An acronym used when someone is amused by something.
STS is similar to the LTM acronym but a little more subtle. It is often used when a person finds something amusing that others may not find as funny like an inside joke. The acronym is commonly replaced by a smirking emoji.