Fletcher: Greta, please! I'm on my knees in a $900 suit.
Miranda: That was incredible. Was it good for you?
Fletcher: I've had better.
Judge Stevens: Mr. Reede, one more word out of you, and I will hold you in contempt!
Fletcher: I hold *myself* in contempt! Why should you be any different?
Judge Stevens: It is only out of sheer morbid curiosity that I am allowing this freak show to continue.
Judge Stevens: How are we this morning, Counselor?
Dana: Fine, thank you.
Judge Stevens: And how about you, Mr. Reede?
Fletcher: I'm a little upset about a bad sexual episode I had last night.
Judge Stevens: Well, you're young. It'll happen more and more. In the meantime, what do you say we get down to business?
Max Reede: I wish, for just one day, Dad couldn't tell a lie.
Answer: As you said, he was testing to see if the wish was broken--by going up to an attractive woman and talking to her. While we don't hear what happens, he apparently said something a little too "forward" to her (probably more forward than he would have done otherwise, hence the "not as well as I had hoped"), and got slapped, so he knew that he was still under the wish's effects.
Chanteuse66
But I want to know what he said to the woman.
It's deliberately made unclear what he specifically said, because him getting slapped in the face is the gag that shows the audience that he's still under the spell. If we heard what he said, then we would know right away the new wish wouldn't have worked. It's ultimately up to the viewer's imagination to decide what he told the woman.
Phaneron ★