According to Konstantin Stanislavsky, the deeper and usually unexpressed "real" meanings of a character's spoken lines. Of particular importance in the acting of realistic plays, such as those of Anton Chekhov, where the action is often as much between the lines as in them.
is what you say without saying it. Even if you lack training as an actor, you can effectively communicate the SUBTEXT by NOT trying to ACT, but REACT. SUBTEXT is too complex to cover here or in just one of the Private Studies, so RB has included various references and tips throughout the Series. For more, see Sudden Death Gypsy Curse and Xerox Money.
Subtext on the shows refers to sexual undercurrents apparent to viewers. These are moments like in Buffy's "Beneath You" when the girl of the week asks if there is anyone there that hasn't had sex with each other and Spike and Xander look at each other then lower their eyes. This instance was a pretty blatant attempt by the writers at subtext, others may be a little harder to spot unless you are looking for them or have your gadar on high.
Subtext is content of a book, play, film or television series which is not announced explicitly by the characters (or author) but is implicit or becomes something understood by the reader / viewer as the production unfolds. Subtext can also refer to the thoughts and motives of the characters which are only covered in an aside. Subtext can also be used to imply controversial subjects without specifically alienating people from the fiction, often through use of metaphor.
Subtext is a moderately visual programming language and environment, for writing application software. It is an experimental, research attempt to develop a new programming model, called Example Centric Programming, by treating copied blocks as first class prototypes, for program structure. It uses live text, similar to what occurs in spreadsheets as users update cells, for frequent feedback.