Non-Committal Grunt means: A brief, uninteresting-sounding grunt that has a meaning much greater than the spoken expression. Non-committal grunts are not a refusal or agreement. It is merely a prompt for the continuation of conversation, without you exposing your position. You can use it in place of the Yup in cases when you don’t want to agree. This can be used to make a politically more correct version of whatever, pfft. The non-committal grunt is used to communicate the following information: “I have listened to you, and I acknowledge your position. Before continuing, however. At this point in time, I’m not committed to following your points of view. (in Community Dictionary, added by Aidan Stokes)