moon the giant
v. To recklessly disparage a much larger and more powerful rival, particularly a business competitor.

Example Citation:
But Novell has been cautious not to flaunt its success. The mantra at the Utah software maker is to make nice with Microsoft, or as Chris Stone, Novell‘s senior vice president of strategy and corporate development, said: “Don’t moon the giant.”
—Jay Greene and James V. Grimaldi, “It’s open season,“ The Seattle Times, March 14, 1999

Earliest Citation:
Trojan horse strategies depend on the enemy being asleep. If you moon the giant or awaken the enemy, you might get burned.
—Michael A. Cusumano and David B. Yoffie, Competing on Internet Time: Lessons from Netscape and Its Battle with Microsoft, The Free Press, November 15, 1998

The verb to moon means "To expose the buttocks in public as a prank or disrespectful gesture," You might be interested to know that the Random House Historical Dictionary of American Slang traces this sense all the way back to a 1958 film called Beatniks in which a character named Moon says, "One more word...and I'm gonna moon you."

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