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1.
When pregnant women eat junk food with no positive nutritional qualities and claim that it's a craving, they're using the pregnancy craving shield.
"Could you go out and get me another two bags of chips? And a deep fried pizza slice?"

"Really?"

"I'M CRAVING IT!"

"Jesus, put the pregnancy craving shield down already. I'll get it for you. Just stop looking at me like I'm a man-sized chicken leg."
by H.S. Willsy August 24, 2011