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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

Tweetiepying 

The art of waking up a female / partner by slipping the male length into the back of her throat and getting her to say "The early bird catches the worm"
"I was Tweetiepying that girl the other night and the vibrations from the wording made my willy sick"
Tweetiepying by Sylvester123 September 17, 2013

tutant meenage neetle teetles 

Tutant meenage neetle teetles is a shit copy of the teenage mutant ninja turtles
Also, You can't say it without laughing.
Tutant meenage neetle teetles is impossible not to laugh at.

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

Da Derp Dee Derp Da Teetley Derpee Derpee Dumb 

Rob Schneider's latest comedy vehicle.
Rob Schneider derp de derp. Derp de derpity derpy derp. Until one day, the derpa derpa derpaderp. Derp de derp, da teedily dumb. From the creators of Der, and Tum Ta Tittaly Tum Ta Too, Rob Schneider is Da Derp Dee Derp Da Teetley Derpee Derpee Dumb. Rated PG-13.