australian slang. a simple but effective insult, referring to someone who is severely intellectually deficient, with often the additional connotation of also being a
bum, bogan, eshay or similar.
like an extreme version of a doofus.
words such as “
cunt” (a more mild use) or “dog” (a more hurtful and aggressive use) can follow for emphasis, as “gronk
cunt” or “gronk dog”, the latter of which is usually uttered minutes before a fight ensues, between (often under the influence of drugs or alcohol) bogans or eshays of no particular age demographic.