vum /vʌm/exclamation 1verb 1forms 3 exclamation1 •(US) An exclamation of surprise. verb1 •(US, informal) To vow, swear.I vum it's Sunday—you won't see that harpooneer to-night; he's come to anchor somewhere—come along then; do come; won't ye come? — 1851 formsvummed · vumming · vums