| 1. | the topmost layer of crust, as of a pie. |
| 2. | Informal. the highest social class. |
| upper crust n. Informal The highest social class or group. up'per-crust' (ŭp'ər-krŭst') adj. |
Upper class: “The upper crust often have at least one summer house.”
upper crust
The highest social class, as in She wanted badly to be one of the upper crust but it wasn't going to happen. This term alludes to the choicest part of a pie or loaf of bread. [First half of 1800s]