C-bomb /ˈsiːbɒm/ noun2 •(informal) The word "cunt". •Abbreviation of cobalt bomb: A type of nuclear bomb encased in cobalt.But we tend to forget the C-bomb, a hydrogen bomb that could 'transmute' an element such as cobalt into a radioactive element about 320 times as powerful as radium. — 2009 formsC-bombs · c-bombs