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An expression used to convey feelings not able to be expressed with other vocabulary. One could interpret the meaning as bordom, anger, malcumtent, or sexual frustration.
Jenny: "Graah!! Where is my hair brush!"

Kelly: "Graah! My boyfriend needs to get his ass over here now, or I'm turning on the porn!"
by fonta August 25, 2007
An exclamation showing frustration.
"Graah! Why isn't this working???"
by PaganSage August 25, 2007