ram·rod 
/ˈræmˌrɑ:d/ noun
plural ram·rods /ˈræmˌrɑ:d/ noun [count] : a metal bar that is used to push explosive material down into the barrel of some old-fashioned guns
straight as a ramrod or ramrod straight
: in a very straight and stiff way — used especially to describe the way someone stands or sits ▪ The guard stood straight as a ramrod. ▪ He sat in the saddle, ramrod straight.
