What is Mm Hmm?
1.
a sound that describes the following:
yes'um, ok, yea
2.
a sound in written form meaning agreement, 'yes', can also be used as a coy/sexy way of agreeing
1) 'you really like those chips dont you?' 'mm hmm.'
2) 'yo baby, you like when i touch you liek that?' 'mm hmm.'
See 
Random Words:
1. 
Famous Civil War general, later two term Republican president, owner of Grunt's farm.
Ulysses S. Grunt was known as U.S. Grunt.
S..