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When a pregnant woman has an abnormal feeling of excessive growth & weight gain overnight seemingly to have gained pounds of weight and inches to her torso.
Girl: "Damn baby how you feeling these days?"
Pregnant girl: "I feel like I gained 5 damn pounds last night in my sleep."
Girl: " I remember those days. That's a Girth Spirt."
by itookmymedicine June 13, 2009
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