Used as a casul response when you are fed up with someone speaking, to let the
person assume you are following up with them but honestly...you're really not, and you really
don't
care.
person 1: guess what, I passed my exams and got a brand new
car!
person 2: Mhmm. that's nice I guess.
or
person 1: I come with some terrible news....my dog just died
person 2: Mhmm....that's nice. glad to hear that.
person 1: wait what!? so you really
don't
care?
person 2: mhmm. oh-wait--what?-wait-shit-damn-well-hold up real quick....what were you talking about?
person 1: you know what, nevermind.
don't know why I even told you when you won't even listen to me.