When the removal of a penis or other phallic item from the anus brings with it a rather substantial amount of fecal matter, usually coating the tip or head, that insertive device is said to have pulled a plumb.
Our date was going well up until I happened to pull a plumb, and to make things worse the smell didn't hit my nose until after my dick hit the new satin sheets.
by EssTeeDee December 31, 2016