Top Definition
Acronym for the common repsonse: "Thank you for saying thank you."

Used when chatting online and you want to respond to some one's gratitude. This often requires too much typing and energy, so you simply write tyfsty.

Can be extendedly infinitly e.g. "Thank you for saying thank you for saying thank you" - tyfstyfsty
Guy A: Here's the link to the video you wanted.

Guy B: Oh, ty!

Guy A: tyfsty.

Guy B: tyfstyfsty.

etc.
by IB.brilliant. May 03, 2010

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