"The t-word" usually means "tranny" which is a degrading word to call transgender people. Any sane person would discourage a cisgender, or whatever you are, to not use the t-word if you are NOT transgender.

One who has a mania for music.

The T word refers to Transylvania. Transylvania is a region situated in western Romania with a majority Romanian population (~80%). Despite this many Hungarians like to claim that this is ethic Hungarian land. The T word should never be used in a room/space where a Romanian and Hungarian are present.

The "T" Word is a neutered version of calling someone the racially offensive term of "TACO." The "T Word" is similar to the OJ Simpson trial's "N Word" that neuters the offensive word. TACO refers to derogatory Hispanic Taco Eaters who are male prostitutes who perform oral sex for very little money and are often found in malls and on street corners with baggy pants and tatoos