What means "playing with forces beyond your ken" and "your ken can kiss my Barbie" I was watching The Big Bang Theory and then I saw theses phrases that I could not understand. In the context, Sheldon and Penny are fighting: Penny: Oh, no, are all the machines taken? What are you gonna do? Sheldon: No problem, I’ll just do my laundry another night. Penny: Another night? Well, I guess you can try, but deep inside your heart you’ll know that laundry night is always Saturday night. Sheldon: Woman, you are playing with forces beyond your ken. Penny: Yeah, well, your ken can kiss my Barbie.