Meaning : Your 'go-to’ is the workout that you will resort to most commonly when you don’t have the inclination/time to come up with something more original, or else that you will just go to automatically.
Mine are :
Chest / flat db press - weighted dips
Back / chest supported db row - overhand barbell row
Delts / arnold press - one arm lateral raise on incline bench
Legs / bulgarian split squat - goblet squat - single leg calf raise
Biceps / incline db curl - cross body hammer curl
Triceps / close grip bench press - db kickback