FYI definition by Slang.net
This page explains what the acronym "FYI" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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FYI is an acronym that prefaces an informative statement. For example, your mom may text you, "FYI - don't use the upstairs toilet. Dad clogged it."
FYI is similar to the JSYK acronym and skinny term. People commonly use it in emails to share information with the recipients, which can get annoying when they grow numerous and repetitive. People also use FYI as a noun, i.e., "Just an FYI, next week's meeting has been canceled."