1. Someone that spends enough time in different bars to be able to tell you which place has good nachos and which place has REALLY good nachos.
2. Someone that knows the food/bar special schedules for different bars (e.g. Taco Tuesdays, Wednesday Wings, Thirsty Thursdays).
3. An alcoholic.
His advanced hindsight with respect to our choice of appetizers indicated that he was a bar foodie, or at least had been here drunk on more than 10 occasions.