There was this user named "Hard Facts"; it's funny not because of the username per se, but because his username is a 100% opposite of his posts. His name was Hard Facts but his posts were crappy opinions.
Curious to know meaning behind your username, i usually think about Mortal Kombat 4 whenever come across your name.
In cars, it means "make 4", so the fourth generation. Google shows the Volkswagen Golf Mk4 as first option, but I've seen "mk2" and higher used on other car brands too.
So maybe it's his fourth reincarnation
