Mis-spelling of the term "Holdass," which is a synonym of "Grab-Ass", as in to flirt excessively with somebody or to literally perform the action of grabbing a girl's gluteus maximus.
It is also a Norgwegian last name, but in this case it is pronounced "Hold-Aus" as in "AUStralia".
Mark: Hey Kate, do you know Madde Holdaas? Yeah haha I sure would hate to have her last name!
Kate: Yeah that is so funny!
Madde: "You know, there's a reason I have this name, Mark ;)"
Kate: Stop playing Holdaas, you two!