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1.
A hollow log that typically resides in fog or light mist. Recent rumours circulated suggesting they could be sentient lifeforms with an IQ of over 145, but all evidence points towards them being inanimate objects.
During a mushroom shortage Bob Geldolf sat on a foglog whilst visiting Gibralta. (Extract from The Daily Telegraph)
by theyarecomingforyou April 10, 2005
 
2.
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 02, 2009