Mm

[Mark Zuckerberg]

Yes, I agree or I hear you. It mimics the humming sound you make when you nod your head in agreement.

[Zipporah Schumaker]

Mutual masturbation

[Tina]

My Mummy

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.