"was the Civil War term for rookie. The idea was that some of the new recruits were of such fantastic greenness that they did not know the left foot from the right and hence could not be taught to keep time properly or to step off on the left foot as all soldiers should. The drill sergeants, in desperation, had finally realized that these green country lads did at least know hay from straw and so had tied wisps of hay to the left foot and straw to the right foot and marched them off to the chant of "Hay-foot, straw-foot, hay-foot, straw-foot." Hence: straw-foot--rookie, especially a dumb rookie.)"