Joke Collection Website - Cold jokes - What does it mean to say 3 cm from the ground at the end of the joke?

What does it mean to say 3 cm from the ground at the end of the joke?

GG: "Don't be afraid, my place is a little special, only 3 cm!" " "GG was understood by MM as only three centimeters, but MM said," Damn it, it's three centimeters from the ground! "! It means very long. Where are the people who are three centimeters from the ground? How long do you measure?