From IMDB.com: (By no means a definitive source, but someone must have listened to it closely...)

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Wat: Uh, betray us, and I will fong you, until your insides are out, your outsides are in, your intrails will become your extrails I will w-rip... all the p... ung. Pain, lots of pain.
Checked dictionary.com and it doesn't have fong, but it does have this:
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fonge

\Fong"e\, v. t. [See Fang, v. t.] To take; to receive. [Obs.] --Chaucer.
Kinda interesting that's attributed to Chaucer, huh?

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited