TYFA
TYFA definition by Slang.net
This page explains what the acronym "TYFA" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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They thought you hadn't noticed. They thought you would never ask. That's why the person you're chatting with sent you TYFA - because they're glad you asked them a question.
While most people use TYFA sincerely, some use it sarcastically, to denote that they wish you hadn't asked whatever question you just asked. You should be able to tell which type of TYFA you've received by the tenor of the messages that follow it.