what does "that thing is grog mean"

[trick master]

i was reading some dude's review on a game and he basically said the game was "grog"
i need to know what the **** the bloody word means aye

 

[~Dream~]

One word : Google

 

[GreyWizard93]

Yeah thats pretty grog man

 

[Lomboy]

haha nice sig

 

[trick master]

One word : Google

dont you think i've already been trough google in my endeavours to find the very meaning of the word which brings me to type this text?

 

[Pumpkin Ninja]

Typo maybe?