greas·er / ˈgrēsər; -zər/ • n. 1. a mechanic. ∎ an unskilled member of a ship’s engine-room crew. ∎ inf. a rough young man, esp. one who greases his hair back and is a member of a motorcycle gang.2. inf., offens. a Hispanic American, esp. a Mexican.3. inf. a gentle landing of an aircraft.