From chief + -ie.
chiefie (plural chiefies)
- (military, aviation, slang) A chief.
1944, Vocational Trends, volume 7:And did you know the Chiefie said that one of our kites went in the drink last night?
2017, Richard Pike, Phantom Boys, volume 2:Avoiding the Taceval man's gaze the 'chiefie' winked and pulled a face.