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.

Question

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.

Answer

"playing with forces beyond your Ken" means "playing with forces beyond your knowledge", which means "you have no idea what/who you are dealing with". "your Ken can kiss my Barbie" is a witty play on words: Ken=knowledge but it is also Barbie's boyfriend: Ken. Penny is basically telling Sheldon to bring it, that she's not afraid of him.

Hope this helps :)

Answer

Thank you all for the explanations!

Answer

Its a play on words, Ken has a different meaning in each of the sentences

Answer

'Kiss my Barbie" is also a deliberate word play on a ruder expression.  See.  https://www.macmillandictionary.com/dictionary/american/kiss-my-ass