The shortening of the saying "goddamn" when looking at a voluptuous ass of a grade school teacher bending down to help the kid next to you
Steve: "Mrs Johnson, I need some help on this problem"
Mrs Johnson: "Okay Steve, I'm coming"
Harry: *holding back something while veins pop on his forehead*
Mrs Johnson: "Okay Steve so what you want to do is......"
Harry: "GYATT DAMN"
Mrs Johnson: "Harry this is night school, you are a grown ass man."