What do you think of me making jokes about my wife with my friends
That's not nice. Does she know about it?
No she doesn't, but I've already made up my mind.
You should not make jokes about her. It would hurt her feelings to know that you are talking about her behind her back.
I think she's kind of a bitch so this should be okay.
Speaking poorly about your wife may be seen as in poor taste by some of your friends. You may insult them more than make them laugh if this is how you joke around.