Giving it all, taken from WW2 B-17 gunners who had a string of bullets that fed into their guns that measured nine yards long
Give them the whole nine yards.
by Barnes 199 May 13, 2006
A term dating back to World War 2 referring to a fighter pilot using up all of his ammunition attempting to bring down an enemy plane, the ammunition belts the guns used being nine yards in length on average, hence the term.
I gave him The Whole Nine Yards, and he still wouldn't go down!
by dood87 March 30, 2010