개저씨

Etymology
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Noun

 * 1)  older bastard; elder son of a bitch

Usage notes
The term 개저씨 is a recent innovation in Korean, effectively a portmanteau of the slur 개 (dog) and the title 아저씨, used to refer to older males who abuse their age-rank in social situations. It could be considered as a special case of (or pun on) the slur 개자식, although it is closer in tone and vulgarity level to insults like 개새끼.