whammo UK /ˈwæməʊ/US /ˈwæmoʊ/exclamation 1noun 1forms 1 exclamation1 •(informal) Used to emphasize the suddenness of an event.So, I'm driving along when, whammo, a tree falls in front of the car. noun1 •(informal) An action-packed scene in a film, etc.[…] dawdles for 15 minutes before presenting a mild whammo. The whammos start at about 33 minutes and then pile up at 36 minutes, 40 minutes, 50 minutes, 59 minutes, and 64 minutes. — 2006 formswhammos