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A disliked or annoying person. Originates from the idea that people who lie and deceive suffer from stress. The stress leading to stomach conditions, and then stomach operations: a person requiring a colostomy bag.
That guy's just a freaking gutbag.
by Richard Watts October 07, 2004
A vagina.
My ex was a bitch, but she had a magical gutbag. I really miss her.
by swetepete November 05, 2009