In terms of a lover, future Mother of your children. Often used to subtly declare ones affection for ones relationship with a caring soul. Transcending the stigma of society, without prying eyes being aware of your dedication.
Money match. Usually a test of skill against another person, this forces each player to be more serious about competing against each other once money is on the line.
Generally used as a way to keep old hobbies alive and exciting, to get a simple rush out of gambling, and to compete on the highest level of skill each person is capable of.
Boy: Fuck, bball is boring now..
Boy2: MM 10$?
Boy: You're on.
I am amazed at how internet porn sites make for some great mm!
It definitely comes in handy (no pun intended!) whenever Shirley goes away for the weekend! :)