1 definition by TenshiroDaiki
n. A combination of the words 'slug' and 'dog', slog generally refers to one who is massively overweight and often breaks to recover energy. The etymology is as such because the slog is slow like a slug, and easily becomes "tired as a dog". Slogs often appear to have a mental or physical disability, regardless of whether or not they actually do. As such, a slog may be outcasted as overly-strange or unsociable.
by TenshiroDaiki July 31, 2008