"Seniors, particularly women, are the largest and most frequent target of financial scamsters, and this ganef takes the cupcake." — Malcolm Barko, Creators Syndicate, 5 Nov. 2013
Some obscure slang words are good for insults, and ganef is one. Ganef—also styled as gonif and goniff—has been in use in English since the late 1830s. It's a Yiddish borrowing, and originally comes from the Hebrew word gannābh, meaning "thief."