from the GNU version of the Collaborative International Dictionary of English.
- noun One who excuses or justifies himself.
Sorry, no etymologies found.
It does not usually do the person spouting it any good at all, tending instead to make him look weak and desperate, and it cannot help making others look awful as well, both those who get blamed by the self-justifier and the president who can't seem to keep order in the classroom.
'Only Kidding' 2008