The Brief: The face palm emoji is used to communicate "oy vey" or "oopsie daisy." It conveys emotions including but not limited to embarrassment, stress, and frustration. 

Bluesquiggle
DEEP DIVE

The face palm emoji is used to communicate “oy vey” or “oopsie daisy.” It conveys emotions including but not limited to embarrassment, stress, and frustration.

https://twitter.com/xxohsocoldxx/status/1018524360079036418