I guess the grandparent means "охуительно". The fact the Russian has flexible word formation combined with a well-developed swearing vocabulary means that you can express quite complicated concepts using nothing but swear words and it works wonderfully well.
As a non-Russian-speaker, I would need more details to make sense of that. I gather that "охуительно" (1) is obscene and (2) means something like "awesome", but what's its obscene meaning and what's the link between that and meaning something like "awesome"?
A bit of googling suggests that the word is somehow derived from a word meaning "penis", but it's a lot longer than that word so presumably there's some other stuff going on.
Another month, another rationality quotes thread. The rules are: