(n.) The cloud of stench left in the bathroom after someone takes a deuce.
"Don't go in there, man, there's some serious log fog happening."
by Inox November 19, 2013
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A joint and/or blunt of gigantic proportions.
Man, I went to Willie's house last night, and that dude rolled up one hell of a fog log.
by prospero418 April 3, 2009
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