"Little Johnny's Speech Impediment" joke

Little Johnny and his little red wagon goes to the store and he asks the clerk "do you have any bum?"

The clerk said, "no you mean gum."

Then Johnny asks the clerk "do you have a fuck it?"

The clerk said "no you mean a bucket."

Finally Johnny asks the clerk " do you have a cock and spank it?"

The clerk said "no you mean a cocker spaniel."

As Little Johnny goes home with all of his stuff in his little red wagon he suddenly forgot one more thing so he goes up to a old man and he said to him.

"Sir can you hold my bum and fuck it while I get my cock and spank it?!"