One of the only two types of ships in the world. The other being "targets"

1.Submersive ship that can sink to great depths and combat other ships. They are used frequently in the military for commandeering guided missles.

2.The Penis when fully erected.

A long, hard, erect tube full of sea-men.

an underwater form of transporation that is long, hard, and full of sea men.

Stealthily surfing the internet at work. Screens are switched quickly when someone walks by your desk so they don’t see you surfing the internet, when you should be working. ‘Surfing' is on top of water but you had to go underwater when someone came by...Submaringing.

Submarine is the fact of leaving a piece of shit in the bubble bath of another person

which will arise after a certain time just like a submarine.
And while waiting for the submarine to come up you absolutely must listen to the Beatle song about the submarine.

to put it simply a submerged blowjob and/or handjob. likely to take place in a jacuzzi or hot tub.