noun
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.
ネットで炎上した企業に電話突撃が起きた。
A phone-bombing campaign targeted the company that went viral online.
匿名掲示板で電話突撃を呼びかける書き込みがあった。
There was a post on an anonymous message board calling for a phone-bombing.
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.