A short for Mass Rapid Transit. Around the 97-98, the first subway system for Taiwan was built. That's how the subway are called in Taiwan. (though it's not always underground)

Moronic Rattle Throwers.

A new breed of the male species, born from the 21st century's metro-sexuality whereby the man in question is hyper sensitive and overly in touch with his emotions but too mentally stunted to express these through civilised means.

Asides from their good grooming/hygiene and sense of style, the metrosexual man also enjoys regular lengthy conversations, or "deep and meaningful's" to convey their most heartfelt emotions.

It is here however where the similarities end, a classic MRT will forgo the DM's in favour of a more childlike approach to conflict, in the form of what popular culture has named a Mantrum, hence the rattle throwing reference.

Mass Railway Transit, a subway system of the city of Bangkok, Thailand

Magister's Terrace---a level 70 instance in World of Warcraft

Mentally Retarded Female. Commonly mistaken for Mr. T, but when labeled "MR T" it in fact means the female is mentally retarded.