SYY
SYY definition by Slang.net
This page explains what the acronym "SYY" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who wants you to SYY wants you to "shut your yapper." This rude acronym is a slightly-less crass way of telling someone to STHU or STFU.
Yapper is a slang term that means "mouth." Someone who wants you to shut your yapper wants you to stop talking ... possibly so they can get in a word or two of their own.