Probably boring stuff like:
John: Mary, would you like to attend the opera this evening?
Mary: F*cking-A. Should I wear my black dress?
John: Why the f*ck not?
Mary: F*cked if I know. Oh, f*ck! I just remembered. It got f*cked up in the wash.
John: Well, f*ck the opera. Let's stay home and f*ck.
Mary: Good f*cking idea.