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1.
A cupboard or cellar dedicated to the aging and storage of hams, sausages and other pork products.

Generally designed to be bearproof, and often accessed through a heavy wooden trapdoor in the floor.
Ben's been aging a pork shoulder in the hamflatch--he's taking it out for a Sausage Fiesta this afternoon.
by El Lémur August 13, 2009
 
2.
A rather nasty vagina.
Bry-bry says he dug a big ol' ditch up in that slapper's hamflatch.
by Padge Gnu August 27, 2009