Originally from ε°γ (toutoi), meaning precious, valuable or priceless, it became Japanese internet
slang "γ¦γγ¦γ (or γ¦γγ¦γ)" 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.