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Originally from 尊い (toutoi), meaning precious, valuable or priceless, it became Japanese internet slang "ていてい (or てぇてぇ)" 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.
TeeTee by _whistler June 7, 2021
Related Words
Teegen teege TeeGee Teegeeack teeger Teegan teener Teagen teepee teigen
japanese vtuber slang for "precious" or "wholesome" or something along those lines, there is no proper direct english translation.
that moment between watame and haachama was so teetee
teetee by madokatan March 18, 2020

teenerweener 

a person with an excuse for a cock.
I was with him last night, he has a teenerweener.

yo what up teenerweener.
teenerweener by yungvlonekillah March 18, 2020
A majestic feline, often with a floofy tail and a mane.
I’d like to introduce you to my teekers, Deebo. Don’t pet him for too long or he will bite you.
teekers by Fleabo February 3, 2023

Filthy Teeter 

A very dirty vagina. It smells terrible and keeps many guys away unless if they want diseases.... lots of diseases.... crabs.... aids.... ganaria.... super aids
I can't believe Joe slept with her she had a Filthy Teeter he should definitely get checked at the free clinic.
Filthy Teeter by x8MikeHunt69x April 13, 2009
Not to be confused with "Teageun," Taegeun was an early 21st century surrealist spoken word poet. He was known (and widely respected among artists and gamers everywhere) for uttering early 21st century gamer parlance up into the late 2010's. (After which such terminology was widely replaced with twitch chat speak.)

Examples include terms such as: "Gg" & "ez" where the phrase would be re-uttered two to three times.
"Man did you see Teageun popping off on mercy last night?"

"Nah man, Teageun is a mercy one trick. I was watching Taegeun, he's better. He verbally abuses one tricks in Overwatch match chat."

"Oh true. Gg ez"
Taegeun by DigitalNik January 24, 2019