This word has been thrown around alot on these boards, so I figured I'd post the (un)official definition:
Libtard - n. As repetitive as it sounds, it stands for "liberal retard." A libtard wants to live in a fantasy world (in which life is the way that they WISH IT WAS) as opposed to dealing with life the way it actually is. (This explains the religious fervor that many of them demonstrate when it comes to smoking pot).
The most idealistic libtard envisions a time when science/technology and Socialism will eliminate all poverty, hunger, war, disease, injustice, unemployment and prejudice. (It is a nice pipe dream but human nature will forever stand in the way of that goal).
Most libtards subscribe to the notion that "people are basically good", and build their foundation for activism and "improving the human condition" on that faulty premise. Because they deny the facts about human nature, their "reasoning" is diametrically opposite to common sense (blue states vs. red states).
The reality that people have different initiative levels, are basically selfish, and often work for their own interests before helping others, puts a libtard's panties in a wad. So, when citizens will not voluntarily comply with various libtard prescriptions for "the common good", then laws must be passed, or force used, to MAKE them comply. (It is the gradual path to totalitarianism). Likewise, his/her na´ve cries of: "can't we all just get along...