Facepalm
ɑrtsaːhoz kɑp ɑz ɑrtsaːbɑ tɛmɛti ɑ kɛzeːt frustraːtsioː kiːnoʃʃaːɡ kifɛjɛzeːʃeːrɛ
In Hungarian Arcához kap, az arcába temeti a kezét (frusztráció, kínosság kifejezésére).
The act of covering one's face with one's hand, as a gesture of frustration, embarrassment, disbelief, or exasperation.
Example
"I had to facepalm when I saw his mistake."