'umms', intentional or not, can actually help the speaker in seeming more genuine. For example, I hit on a lot of women and in the process, over some time, end

'umms', intentional or not, can actually help the speaker in seeming more genuine. For example, I hit on a lot of women and in the process, over some time, end up saying basically the same lines and stories. I risk coming across as too-smooth/scripted which is just as bad as being very nervous. Especially when retelling a story, I intentionally inject plenty of 'umms' and look up as if I am trying to recollect something from my memory.