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1.
(1) Fecal excrement of such abnormally large girth that it is (or would be) unable to be eliminated by the flushing mechanism.

(2) Large bowel movement that overwhelms the capabilities of modern plumbing. May or may not be the size of the hole in the toilet.
Michelle dropped the old log clogger at Sarah's apartment and she had to have her septic system reinstalled

You call that a log clogger man? I have thicker dumps that that after a week of eating split pea soup.
by Tom and Michelle May 20, 2008