For those who may not get this joke because they are not very familiar with Disney characters, here is an explanation of the punchline...
(I will use "freaking" instead of the word I used so I'm not dropping "F" bombs all over the place)
You can call someone "Crazy", but if you call them "freaking crazy", it means that they are VERY crazy.
So, when my joke says "freaking goofy", you can take that in one of two ways:
1) "Goofy" can mean "to act stupid", so "freaking goofy" could mean she acts "very stupid".
2) But "Goofy" is also the name of another Disney character (the picture of the dog posted), so "freaking goofy" could also mean she is having sex with goofy.
So, the confusion between the two meanings is the funny part (because the judge was thinking one way and Mickey meant the other way)