A turd that is submerged in the U-bend of the toilet like the german submarines (U-boats) used to hide beneath the surface of the sea. 9 out of 10 U-bend U-boats are unflushable in the average toilet.
For fucks sake, that U-bend U-boat just won't flush! Pass me the bog brush Dave, it turd bustin' time!
by MSN NINJA April 19, 2009
To preform a u-turn in a car/truck/van very poorly. A half handbrake turn, a 3 or more point turn or to hit something while turning around.
"I just gotta buck a u-boat over there and we're good."
"That was brutal, way to buck a u-boat buddy."
"That was brutal, way to buck a u-boat buddy."
by StonedPimpSO February 25, 2009
by jcracky April 23, 2013