It's when your penis grows larger every time you lie to your wife or girlfriend after she asks, "Where have you been?"
The enlargement comes from the satisfaction of knowing you and your penis have been having fun without her.
After arriving home late from a night out with his buddies, Dan had to sleep on his side with his back to his wife, the entire night, after she angrily woke up and said, "Where have you been all night?" That way he could hide his Pinocchio Beef.
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