Mmmm~

Mmmm~ is just a moan when sexual intercourse happens.

A dude married to a girl: Wanna have sex?
The girl that is married to the dude: Sure!
A dude married to a girl: *starts going fast*
The girl that is married to the dude: Mmmm~ harder...

Mmm mmm mmmm

This is a word to use to get out of saying actual word and great to use when not paying attention.

Person one: (Tells a joke)
Person 2:(not listening) mmm mmm mmmm