You've heard of the fedora-wearing World of Warcraft-playing neckbeard-type people on the internet, right?
I have no idea about the 3.14 bit (Pi to 2 D.P???) but it's my understanding that they use the acronym 'qt' as shorthand for 'cutie' when blog posting. I have no idea on the TFW part, it's probably one of those 4chan, 9gag or imgur acronyms such as 'MFW' (My Face When) or 'MRW' (My Reaction When)
Official Urban Dictionary definition of a neckbeard:
(n) Derogatory term for slovenly nerdy people who have no sense of hygene or grooming. Often related to hobbies such as card gaming, video gaming, anime, et. al.
If this party is full of f*cking neckbeards, I'm out. I've got better things to do than sit around with a bunch of unwashed nerds.
http://www.urbandictionary.com/define.php?term=neckbeard&defid=1558347