It refers to (Q)uentin Tarantino and (U)ma Thurman. They actually thought of the idea together while filming Pulp Fiction.  In the diner, Uma's character is telling John Travolta's character about a TV show she was in... 

Go 2 mins in.  http://www.youtube.com/watch?v=A8X2SM0ioJ4

Uma and Quentin then chatted and created the bride.