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1.
A pejorative term for an individual who repeatedly and vehemently engages in arguments on social justice on the Internet, often in a shallow or not well-thought-out way, for the purpose of raising their own personal reputation. A social justice warrior, or SJW, does not necessarily strongly believe all that they say, or even care about the groups they are fighting on behalf of. They typically repeat points from whoever is the most popular blogger or commenter of the moment, hoping that they will "get SJ points" and become popular in return. They are very sure to adopt stances that are "correct" in their social circle.

The SJW's favorite activity of all is to dogpile. Their favorite websites to frequent are Livejournal and Tumblr. They do not have relevant favorite real-world places, because SJWs are primarily civil rights activists only online.
#1:

A social justice warrior reads an essay about a form of internal misogyny where women and girls insult stereotypical feminine activities and characteristics in order to boost themselves over other women.

The SJW absorbs this and later complains in response to a Huffington Post article about a 10-year-old feminist's letter, because the 10-year-old called the color pink "prissy".

#2:
Commnter: "I don't like getting manicures. It's too prissy."

SJW: "Oh my god, how fucking dare you use that word, you disgusting sexist piece of shit!"
by poopem April 21, 2011
 
2.
Or SJW. A term that bigots use to insult people who don't like their bigotry - someone who fights against discrimination and hatred, annoying people who like to discriminate and to hate. Hard to believe that basically calling somebody as righteous as Martin Luther King Jr. is now an insult, but the Internet is a sad, sad place.
It's always hilarious to hear SJW used as an insult. "Social justice warrior" is the basic plot of most '80s action shows and cartoons. Arriving in places and fighting against discrimination? The A-Team were social justice warriors. It's practically a synonym for Knight Rider. Insulting someone for respecting other people is like insulting them for masturbating -- the fact you don't do it has way more to do with why you're so upset all the time. (Luke McKinney, Cracked.com)
by igm3001 September 30, 2014