NTBT is a
text/
chat/IM abbreviation that stands for "No Tell, Bro Talk." It is generally used as a preface for sensitive information, especially in regard to
something that a bro would not want his girlfriend to know about.
Text sequence between two bros.
Bro 1: Dude, you'll
never believe what happened last
night.
Bro 2: What?
Bro 1: NTBT.
Bro 2: Of course.
Bro 1: I totally fucked my girlfriend's
sister.
Bro 2: Nice.