Yup, Nope, and Sure. These words are ones I use when I am non-committal.
Yup - means yes but I have a casual view of it
Nope - means no but again I have a casual view of it
Sure - fine, if I have to, don't want to but feel I have no option of getting out of it.
I try to not use these words as they don't respect or valued the people I am using them with.
I am trying to get them out of my vocabulary - I want relationships and communication with those in my life to have value and be honored with honesty and respect. This kind of causal and wishy-washy communication does not value or respect anyone.