upper crust
/AH1 P ER0 K R AH1 S T/noun
- 1
(usually with the) The social elite, the highest social class.
adjective
- 1
Posh, upper-class; pertaining to the upper crust.
“An upper-crust London party.”
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Source: https://en.wiktionary.org/wiki/upper%20crust, https://en.wiktionary.org/wiki/upper-crust