Originally from å°ã (toutoi), meaning precious, valuable or priceless, it became Japanese internet slang "ã¦ãã¦ã (or ã¦ãã¦ã)" roughly meaning someone else's actions are wholesome, or precious.
Popularised in the west by subtitled V-Tuber clips, where it was used typically during moments where the V-Tubers were acting affectionate to one another; this hard to translate word was often simply romanised. This resulted in several spellings, the most popular of which seems to be "TeeTee", whith other variant such as: tee-tee, tee tee, tei-tei, TT and te-te.
Check out this clip of OkaKoro being TeeTee.
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