The phrase "what a wicked thing to do to make me dream of you" is a line from the song "Wicked Game" by Chris Isaak. The song is about a complicated and intense romantic relationship, and the line is part of the chorus. The full chorus goes:

"No, I dont wanna fall in love (This world is only gonna break your heart) No, I dont wanna fall in love (This world is only gonna break your heart) With you (With you) (This world is only gonna break your heart)

What a wicked game to play To make me feel this way What a wicked thing to do To let me dream of you What a wicked thing to say You never felt this way What a wicked thing to do To make me dream of you"

The line "what a wicked thing to do to make me dream of you" suggests that the person singing the song is feeling conflicted about their feelings for the other person. They are acknowledging that the other persons actions are causing them to have intense feelings and dreams about them, but they are also aware that this is a "wicked" or complicated situation.