Attempting to be noticed, fit in or fill the quite by using ones own words.
A lot of words used but very little worthwhile is said.
While everyone else is watching a movie or having a logical conversation the person guilty of dumbversation continuously blurts out random comments about EVERYTHING and ANYTHING so that others will pay attention to them.
While others are discussing plans to go to an Italian restaraunt for dinner a dumbversator constantly butts in bringing up random fact about anything and everything. It would start with them mentioning an Italian resturant they had eaten at in the past with a waitress who had earings that reminded them of cuff links an uncle wore at their graduation. Then they go into detail about the graduation and the car they drove at that time. Then they start telling everyone how much gas cost at that time, 20 years ago.
When you wake up from an insane night of partying at some sort of Dubstep rave and your neck,arms and any other body parts are stiff. you also have an insane hangover and the dubstep could have influenced you to do things that you wouldnt usually do (dubslut).
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.