whomp UK /ʍɒmp/US /ʍɑmp/verb 1forms 3phrases 2 verb1 •(slang) To hit extremely hard.If you don’t cut that out, I’m going to whomp you so hard your head will spin! formswhomped · whomping · whomps Phrases with whomp whomp onTo defeat thoroughly; to trounce. whomp upTo produce quickly, particularly a meal.