SIA
SIA definition by Slang.net
This page explains what the acronym "SIA" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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When someone you're chatting with sends you SIA, it means there's someone else near their computer, who can read your conversation with them. So, you may want to be careful about what you say going forward.
For example, a friend might use SIA to warn you that their parents or siblings are around. Thus, you shouldn't send your friend anything inappropriate, as doing so might get them in trouble.