purple submarine 

When a guy sits down on a toilet seat to take a dump and his junk breaches the surface of the water. The depth at which one's penis becomes submerged is obviously determined by the abnormal level of water in the toilet. This is often caused by a previous visitor's overzealous donation, clogging the toilet and exponentially compounding the problem...you now have a package that is not only wet, but wet with the aftermath of someone else's bombing run.

Dude, that crap would have been perfectly executed if it weren't for the purple submarine action...I'm gonna go shower.

purple submarine by Encephalitis Jones June 10, 2004

toilet submarine 

Those turds that aren't floaters or sinkers, they bob in-between.

Steve: Dude, check out what just invaded the crapper.

Bob: DAMN!!! That is one huge toilet submarine!

toilet submarine by ed! June 10, 2014

canadian submarine 

When you dip your dick in ice cold water before intercourse.

Dude, she screamed when I tried the Canadian Submarine.

canadian submarine by D Kep November 25, 2016

Human Submarine

1. (adjective) a pregnant woman swimming

2. (noun) a submarine made out of human flesh

Commenter: a pregnant woman swimming is a human submarine

2nd definition---

look at that foreskin submarine!

Human Submarine by amogusrule34 July 23, 2021

Unrestricted submarine warfare

A replacement for "I love you"

Woman: Say those three magic words!
Man: Unrestricted submarine warfare

Unrestricted submarine warfare by paninipenis December 1, 2021

The Sydney Submarine 

When snorting coke off a toilet seat in a certain popular Sydney nightclub, some coke may drop and plop inside (unaccompanied or not by bodily emissions). The process of fishing it out is known as The Sydney Submarine

John was a uni student, he dropped his bag of coke in the toilet and had to do the The Sydney Submarine

The Sydney Submarine by toddbuster December 16, 2015

The Yellow Submarine 

The act of urinating directly into a girl's butthole. In many countries completing this act is the first step into manhood.

So I was buttfucking this chick last night and really had to piss, so I just gave her The Yellow Submarine. It was really messy but totally worth it.

The Yellow Submarine by Slam Jr. December 17, 2008