wombat UK /ˈwɒm.bæt/US /ˈwɑmˌbæt/noun 2forms 1phrases 1 noun2 •A herbivorous, burrowing marsupial of the family Vombatidae, mainly found in southern and eastern Australia. •(Australia, slang) A slow and stupid person; a dullard. formswombats Phrases with wombat wombat-headedStupid, dull, or foolish.