It means no, it can be used in diffferent ways
Do you want to go to have dinner?
"M!"
Do you want to have sex?
"M!"
You have to speak it in a voice of a grumpy old man to show its meanliness
The initial of the most amazing, attractive, caring people that we all love but can't have and therefore take it out on anyone with a name that starts with the letter M.
Someone: "He is kind, caring and passionate"
Me: "His name must begin with an M"
the 13rh letter of the alphabet... thats it. why the hell did you look up m are you THAT BORED
m
when shortened way of calling someone meady usually used if you are british
that lightskin was so M
M is the Luigism version of "L" that ordinary people use, meaning loser because M*rio is a loser and much more.
Oh my god man that's such an M opinion!
M moment!