"Watching the submarine races" is a euphamism for making out (and more) in a car. It's the kind of thing a cop would say to be funny when he knocks on the fogged-up window of your chevy parked in back of the safeway to ask what you're doing there at 1am, as if he doesn't know damn well.

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.

Secret code for making out/having sex, because you can't watch a submarine race; it's underwater. "Submarine" can also be used to mean cock, dick or penis.

1. Can be used in casual conversation while talking to your boyfriend or girlfriend's extremely boring parents. 2. Can be used pretty much anywhere.

Slang: During coitus, referring to the act of watching the penis enter or move in and out of the vagina.