double whammy UK /ˌdʌbl̩ ˈ(h)wæmi/US /ˌdʌb(ə)l ˈ(h)wæmi/ noun2 •(informal) A series of two events that causes adverse effects; a twofold blow or setback.Martinez is fouled before Zico's disallowed goal. His shirt is pulled and his foot is trodden on as he tries to continue his run. A double whammy. Egypt can have few complaints. — 2026 •(informal) A series of two events that causes positive effects; a twofold boon. formsdouble whammies · double-whammies