whap noun 3verb 2exclamation 1forms 3 noun3 •A blow; a hit; a whop. •(UK, informal) A breast. •(Scotland, no longer used) The curlew, Numenius arquata; a whaup. verb2 •(US) To strike hard and suddenly. •(US) To throw oneself quickly, or by an abrupt motion; to turn suddenly.She whapped down on the floor.The fish whapped over. exclamation1 •The sound of sudden blow or hit.Whap, Biff, Ooooof, Sock, Pow, Zok! Batman is back. Gotham City is again leaving its law and order in the hands of a man who wears plastic underpants over his tights. — 1989 formswhapped · whapping · whaps