having a penis long enough, so when you go to the bathroom, your penis is submerged in the water, thus making a submarine type effect.
Dude OMG im totally submarining
by Joseph E November 17, 2004
A bar.
"I went into that submarine over there and got meself another wet."
by Jessica Pille November 02, 2003
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.
"The Submarine's mapped out the bases coordinates"

*groan*"Aaww, man...my submarine is long and hard and fulla semen"
by Michale Jackson's child February 18, 2006
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