Similar to the act of motor-boating, except your face is in her ass.
Your mom and I were watching the History Channel last night and we got heated and I ended up U-boating her ass!
Brbbbbbrrrrbbbbbbbrr....
by Thought Monkey July 8, 2010
Get the U-boating mug.
Large continuous dump shaped like a German WW2 submarine. Usually occurs the morning after a night of numerous beers followed by a curry
"Why were you taking so long in the bathroom?", "Jesus love take it easy, i just sunk a u-boat"
by Jimmy Somerville March 7, 2008
Get the u-boat mug.
a term used to describe a piece of crap floating in the bathtub
John: Dude, she just made a u-boat!

synonyms: submarine , floatin' mocha , hershey , baby bauble , "accident"
by Peter Hirsch May 22, 2007
Get the u-boat mug.
German submarine sandwich. Consists of German salami, onions, sauerkraut, pickles, pickled herring, and german mustard (senf), piled onto a loaf of light rye bread.
Hedley had a choice to make. Did he want the regular Italian sub or did he want to risk the U-boat Butterbrot, which like its submarine namesake held the smell of danger about it.
by steeplejack November 4, 2010
Get the U-Boat Butterbrot mug.
When a dude decorates his dick as a German U-31 class u-boat, and inserts a projectile, such as a nerf dart, into his urethra, so that when he climaxes into his partner, the projectile will be launched into his choice of holes.
I’m searching for a partner to perform the Urethral U-Boat on.
by VyXious January 12, 2018
Get the Urethral U-Boat mug.
The act of having a dump whilst in the bath.
I was having a nice soak last night, and accidently curled out a Dirty U Boat! It stank!
by Ed the Jeb June 7, 2011
Get the Dirty U Boat mug.
'Ramming the U-boat' refers to the act of DP of a young lady with two gentleman's parts in the same nether orifice - whether that be Dv or DA. Once one gentleman's part has been inserted, the second gentleman can be said to be 'ramming the U-boat' as he introduces his equipment alongside the first gentleman's parts - a process which will necessitate two two penii contacting each other repeatedly. The adult actress Gauge can often be seen in her films as the hostess to such an action.

While the act of 'ramming the U-boat' does involve penis-to-penis contact between two men, it's widely accepted to be only gay if the balls touch.
In this film, everything happens: DP, A2M, ramming the U-boat....
by Uncle Whippity May 10, 2007
Get the Ramming the U-boat mug.