shack n. a direct hit on a target by a bomb or missile. Etymological Note: Perhaps from the actual shacks—‘rude cabins or huts’—used in live-fire target practice. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...