yessir /ˈyesər, , ˈjɛsər
, ˌyesˈsər, ˌjɛsˈsər
/ (also yessiree /-səˈrē/) informal ▸ exclamation used to express assent: “Do you understand me?” “Yessir!”.
▪ North American used to express emphatic affirmation: yessir the food was cheap.
– ORIGIN early 20th century : alteration of yes sir.