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1.
Anyone who digs in the ground or mines, specifically in search of something buried. Can be more loosely used to include digging for other reasons. Variations include forty-nining and forty-nined, et al.
Look, ma! That dirty forty-niner just dug himself up some pirates booty!

I was going to go forty-nining at the beach today, but I read that those areas have all been forty-nined already.
by Scoot Bro May 21, 2008
7 3
 
2.
A person who is not very bright but intelligent enough to feed himself and put on his own clothes. The names derives from being 3 cards short of a full 52-card deck.
Don't expect him to be rational. He's a forty-niner at best.
by Slo Joe Jizz October 14, 2010
7 4