Man UTD is not a term United fans refer to themselves as. The term is only used by other supporters as a complete and utter insult to our club. The "u" is meant to be "you" by the rival fans.
An early example of its usage is this chant by West Brom fans: "Duncan Edwards is manure, rotting in his grave, man you are manure- rotting in your grave". The origin of "Man u" is a song to insult the dead Duncan Edwards.
Liverpool and Leeds fans copied this with their own man you /u versions to insult all of the lads who died at munich.
"Man UTD Man UTD went on a plane Man UTD Man UTD never came back again"
And....
"Man UTD Never Intended Coming Home" (if you combine the first letter of each word you get the word "munich").
I hope this makes it clearer that saying Man UTD is an insult, particularly to the older supporters and to see United fans using it now is shameful. I hope a few might read this, understand and spread the word.
So.... Please refrain from using this term ever again!
Use MU, Man United or Manchester United don't be lazy and disrespect the fans and club you love.
We are the most famous club in the world ! We are the best supported club in the world! We are the most succsesfull club in English football history! We are Manchester United Football Club The Gods gift to Football ! Keep the faith !