Nutty Banana
To apply peanut butter to your penis for masturbation or in order to give the reciever of your penis a nutty surprise/treat.
"The girl was surprised when faced with the Nutty Banana rather than the penis she had expected."
Or
"Dude, last night I was home alone, I did a Nutty Banana!"
Or
"Dude, last night I was home alone, I did a Nutty Banana!"