Gatsby confusion

Currently I am reading the Great Gatsby. I seem to have trouble with this one section in which Nick and Gatsby show up at Daisy's house in chapter 7 for the final confrontation. This scene begins with Nick and Gatsby at the door, and the butler on the phone: "  'The master's body!' roared the butler into the mouthpiece. 'I'm sorry madame, but we can't furnish it- it's far too hot to touch this noon!'
What he reall said was: 'Yes...Yes...I'll see.'  "
I'm not quite sure as to what the butler refers to "the master's body". Is this to be taken as Tom's mistress calling, requesting Tom, and the butler replying that this is not a good time;  a foreshadowing of the confrontation aka "hot weather"? Perhaps i'm looking in to this more than i should be, could someone help interpret?