PHILOLOGOS discusses the Hebrew word Metsiya, which means both a good find and a rip-off, and is part of the title of a Talmudic tractate.

UPDATE: Edward Cook e-mails:

Good link on metsiya. The Hebrew word and Aramaic words are different though -- the Heb. is from mem-tsade-alef "to find" and the Aramaic (as in Baba Metsiya) is from mem-tsade-ayin "middle". The linked article doesn't really bring this out clearly.