wham /wæm/noun 4verb 4exclamation 2forms 3 noun4 •A forceful blow.Roger was given a violent wham by his boxing opponent. •The sound of such a blow; a thud.We heard a wham as the hammer struck the wall. •(figurative) A great success. •(figurative) An attempt. verb4 •(informal) To smash or strike (someone or something) with great force or impact; to slam, to whack.My Wobblie worker buddies taught me to wham anybody who bothered me hard and fast in the crotch with my knee or my elbow. — 1994 •(informal) To smash or strike with great force or impact.She takes her foot off the skateboard. It keeps going without her and whams into the garage door. — 2009 •(informal) To propel (something) with great force by kicking, striking, throwing, etc. •(informal) To move quickly or loudly. exclamation2 •Used to indicate the sound of a forceful blow, an explosion, etc.Wham! The truck hit the wall. •Used to indicate something dramatic, sudden, and unanticipated has occurred.Our relationship was going smoothly and then wham! Out of nowhere he told me he was leaving me for another woman. formswhammed · whamming · whams