I have been called a slacker, someone that doesn;t have a work ethic and avoids work
Aw really? That's mean of people! Why do you think they would call you that?
The word slacker has been around since 1790 or so 
Oh really? How did they come up with the term slacker?
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