A phrase that describes a couple or couples making out in a car when one or both are out of site below the line of the car windows. The phrase relates to one or both participants 'diving' out of sight. It also relates to the phrase muff diving and going down when the man has his face buried in a woman's pussy in the same way a submarine captain pulls the periscope to him and wraps his arms around it.
"Are you taking Joan to the submarine races this weekend?"
"Hell Yeah. That girl loves to 69."
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