I presume that Rob would have been OK with "greatest of all time", which indeed is the top result once you click on the link. The problem is that the highlighted snippet on the Google page is significantly "racier":

  Urban Dictionary: goat
  www.urbandictionary.com/define.php?term=goat
  Urban Dictionary
  Tucking back your balls and dick, then bending over thus 
  resembling the back of a goat...according to the rules of 
  the game, the person who looks gets 4 kicks in ...