Source : Webster's Revised Unabridged Dictionary (1913)

Wish-wash \Wish"-wash`\, n.
   Any weak, thin drink.

Source : WordNet®

wish-wash
     n 1: any thin watery drink
     2: nonsensical talk or writing [syn: {folderol}, {rubbish}, {tripe},
         {trumpery}, {trash}, {applesauce}, {codswallop}]