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3.
MR
Stands for ' Mentally Retarded '' .. if these are your initials you are mentally impaired. Can also mean, scary monster, ugly mothafucker.
that kid drooling over there is an MR..''M.R.''
by djcoe February 10, 2008
 
1.
MR
Mentally Retarded. Used instead of saying "retarded."
That is so MR dude. He's totally MR.
by bp December 16, 2004
 
2.
MR
M-ental R-etard
You are a complete MR dude!
by Inner Circle February 22, 2004
 
4.
Mr.
A title used by ignorant or immature people in order to mock someone of authority or greater intelligence when losing an argument. Usually added to the beginning of the latter's origional name or title.
Police Officer: "Ma'am, have you been drinking tonite?"
Drunk Woman: : "Listen Mr. Police Officer, I swear I only had to beers."
by Mr.Man of Sri Lanka July 15, 2010
 
5.
mr
music removed

the process of removing the background music of a music video to determine whether or not the band would sound good at a live performance.

often only used in kpop.
dude. wondergirls sound like shit with mr.
youtu.be/m9KtwSp4_bM

hey. snsd still sounds pretty good with mr.
youtu.be/QRbdHyNeF8o
by a.n.o.n.y.m.o.u.s... November 11, 2011
 
6.
mr
MR, in terms of online FPS games, means maxrounds. So basically mr determines how many rounds you will play.
1st Guy: mr? (maxrounds)
2nd Guy: 15

Meaning they will play 15 rounds
by FaiLisOP March 17, 2009
 
7.
masterbation race. Typically when your girlfriend is ragging out and you cannot have sex. You want to aim for a tie.
I was having a M.R. with my girl, and I won all over her face.
by Gabbangtiffalicious November 29, 2011