A schlubb is a schmoe about to die of sloth. A schlubb is one lazy mutha effa. See "a bump on a log."

When you eat dirt for the first time and leave your family to build a shack in the woods

to wear the most daggy comfortable clothes you have and have a lazy day at home. usually happens on a weekend, specifically Sunday. you do not care how feral you look, what house work needs doing, where anybody is or what they are doing. the kids could be setting fire to the yard and you would not care. only the television, your book or facebook matters. if it is out of your reach it does not exist (chocolate or beer being the exception).