subs. (American).1. One who BOOMS or causes an enterprise to become flourishing, active or notorious.
1883. Times, 26 Sept., 8. [He] is a North-Western BOOMER of great earnestness.
1885. Boston (Mass.) Journal, Aug. 19, 2. 4. The Oklahoma BOOMERS.
2. (common).Anybody (or anything) considerably above the average: a fine woman, a horse with extra good points, etc., etc.