Milk mouse came from the famous ancient philosipher by the name of Moe Jiller. We all know Moe said it best when he saw a hideous fat retarded girl and screamed "ahhhh milk mouse." If the person is incredibally fat they are reffered to as milk moose. The ancient mesopatamian's believes milk mice to be a gift from the gods to show the normal people how ugly they could have been, thus making them feel better about themselves. This also, in effect, later on in the 20th century gave nerds and white trash people that would actually have sex with their virginal bodies.
Wow that ugly, fat, retard is definately a milk mouse