also: おやじがり
noun
street violence against middle-aged men; oyaji hunting
Colloquial term for a type of street crime in which groups of youths target middle-aged men (often salarymen) for robbery or assault, typically in urban areas at night.
夜の繁華街でオヤジ狩りが多発している。
There have been many incidents of oyaji hunting in the downtown area at night.
酔っ払ったサラリーマンがオヤジ狩りの被害に遭
A drunk salaryman fell victim to oyaji hunting.
Compound of オヤジ (oyaji, 'middle-aged man') and 狩り (kari, 'hunting'), literally 'middle-aged man hunting'. The term emerged in Japanese media in the late 1990s to describe a specific type of street crime.