Four orders of magnitude above a m8. If someone is your m12, they are not just your friend anymore, they are your soul mate.
Here is a simple chart to explain:
m7 - acquaintances
m8 - pals
m9 - really good friend
m10 - best friend
m11 - in love
m12 - soul mate
She is the love of my life, she is my m12.
a superior word for the term "m8"
sup m12
sup, m8
fuck you you are unsuperior
loser