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.
by _whistler June 7, 2021
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
by madokatan March 18, 2020
Verb: To use the restroom. Usually used by females.
I have to go teetee!
by sdigity April 30, 2007
When your dog has to go potty and is spinning around in a circle.
Bub had to go teetee this morning so hims went out on the lawn out back.
by Maddogg radio April 4, 2022
n. teeh-teeh-z.

A cuter way of saying titties!... and a less gross way.

Yay! Boobs for everyone!

Guy 1: "YO! BITCH! WHAT'S YOUR PROBLEM? GODDAMMIT, PICK UP YOUR DOG'S FRIGGEN POO!"

Guy 2: "Uh, excuse me. Calm yo teetees!

Guy 1: "Alright."
by poopy bunghole March 25, 2009
an ethnic person who is really unco.
Also TT or tidee
omg jeff! yous a teetee, bro!
whos a tt?? yous a tt!
by tha wok boy March 17, 2006