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1.
I've always understood it to be an abbreviated way of saying 'something like that' in my part of the southwest.
The Brits certainly thought we went native, or somesuch, in our attitudes here in the colonies.

Been playing Civ 3 a lot , don't ask.
by Tim?!? May 21, 2005
 
2.
Simply means "some similar (thing)".
He was trying to tell me that the moon is made of cheese, or somesuch nonsense.

by Geater January 14, 2008