1. What does it mean?
TMT is an English-letter abbreviation used in Korean for 투 머치 토커. It describes a very talkative person, especially someone whose explanation or story keeps expanding.
Also written or said as 투머치토커
2. The nuance
Unlike TMI, which labels excessive information, TMT labels the talker. It can be affectionate self-description or a complaint; it is not a standard personality diagnosis.
3. Examples
“새 카메라 얘기만 나오면 내가 TMT가 돼.”
I turn into a nonstop talker whenever someone mentions my new camera.
“친구 둘 다 TMT라 산책 두 시간이 금방 갔어.”
Both friends are chatterboxes, so two hours of walking flew by.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.