One thing I dislike the most is a slacker. 
me too a slacker by definition is someone who avoids work and basically has no work ethic
I'm actually going through that now with someone at work who definitely lacks work ethics. 
That is so hard especially knowing they get paid the same as you and you are working, it is not know for sure but the term started either in 1790 or 1898
Exactly and I  think it is out rages like you are getting paid to do nothing at all there are some hard working people in the world and slackers make them look bad or try to.
describe someone who was not participating in the war effort, specifically someone who avoided military service, equivalent to the later term "draft dodger". Attempts to track down such evaders were called "slacker raids". During World War I, U.S. Senator Miles Poindexter discussed whether inquiries "to separate the cowards and the slackers from those who had not violated the draft" had been managed properly. A "San Francisco Chronicle" headline on 7 September 1918, read, "Slacker is Doused in Barrel of Paint". The
Slacker
A slacker is someone who habitually avoids work or lacks work ethic.
Origin.
According to different sources, the term "slacker" dates back to about 1790 or 1898. "Slacker" gained some recognition during the British Gezira Scheme in the early to mid 20th century, when Sudanese labourers protested their relative powerlessness by working lethargically, a form of protest known as "slacking".
World wars.
In the United States during World War I, the word "slacker" was commonly used to