Top Definition
30-mm 5-barreled rotary cannon made by General Electric used primarily in the Fairchild A-10 attack plane; one big ass gun. Standard HE shells are 11.4 inches long.
"Te iraqi 7-72 broke in half under the hail of 30mm cannon fire from the gau-8"
by Mike Sides July 20, 2006
5 Words related to gau-8

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