phone-bombing; flooding with complaint calls
Internet slang for a loosely organized campaign, often via anonymous message boards, to deluge a company or organization with phone complaints.
A phone-bombing campaign targeted the company that went viral online.
There was a post on an anonymous message board calling for a phone-bombing.
炎上 refers to a social media backlash or online firestorm, while 電話突撃 specifically describes the act of flooding a target with phone calls as part of such a backlash.
電凸 is a more common abbreviation for the same concept, often used in online discussions.
Compound of 電話 (telephone) and 突撃 (charge, assault), literally 'telephone charge'. The term likely emerged from Japanese internet culture to describe coordinated phone-call harassment campaigns.