U-boat 

literally "unterseeboot" or German for "Under water boat"

OK, It's a German submarine.

U-boat by IrishRepublicanArmy December 21, 2003

U-boat 

this is the name of drink, mostly use in poland. put short-drink (wet) of vodka into your glass of beer and drink it all in very short time

-o man. i'm so drunk! i've drink 5 u-boat's in 20min!

U-boat by qwertyswertly December 29, 2005

u-boat 

a submarine used in world war one and two

"omg the uboat is coming"

u-boat by Taylor Hewitt October 26, 2004

U-boat 

When a man sneaks up on his girlfriend or wife while she is sleeping and puts it in her butt.

While Emma slept, Gary snuck under the covers and gave her the... u-boat.

U-boat by The Blodger October 27, 2011

U-boat 

A long and sturdy albeit plastic turd that bends in a U plugging the toilet when the moment off truth arrives.

Man I had to swab the deck after U-boat 7:17 left the dock.

U-boat by delmarskd! October 20, 2011

u-boat 

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"

u-boat by Jimmy Somerville March 7, 2008

u-boat 

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"

u-boat by Peter Hirsch June 11, 2007