Derived from the phrase "Dim as a Toc H lamp." ("Dim" meaning unintelligent - see dim.)
Toc H is a Christian Service club created in 1915 during the First World War. Each Branch or unit of Toc H may be issued with a lamp which can be used for the traditional "ceremony of light" at meetings. The small wick gives off a dim light. (Source: Wikipedia).
Definitions include: a person who will offend anyone regardless of their race, gender, sexual orientation, political leanings, etc. while claiming to not harbor any hatred towards those offended others.
Definitions include: One who has not past a 3rd grade education, is partial to redneck lifestyle, unemployed, divorced multiple times, lives in a trailer house, and often pretends to have served in the military.