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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
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
Means "Hello" in the Finnish Langauge.
Kimi: Terve Heikki

Heikki: Terve, Mitä kuuluu?
terve by Skotlantilainen January 6, 2010

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