Rapper Nas -- Georgia House Foreclosed, Sold At Auction

Life's a bitch ... Nas sang it and now he's living it ... because besides being knee deep in tax debt, TMZ has learned the rapper just lost his Georgia crib to foreclosure.

According to official records, Nas purchased the 2-bedroom, 3-bath pad back in 2004 for $585,000 ... but according to SunTrust bank (which issued him the loan) ... Nas couldn't foot the bill and defaulted on the payments, still owing $507,000.

SunTrust recently foreclosed on the property and then sold it to the highest bidder at public auction last month for $348,500 ... WAY LESS than the rapper paid eight years ago.

It's a steal for the new owner -- the house is over 3,500 square feet with a walk-in pool and hot tub ... granite counter-tops ... custom theater ... gym and game room.