My parents used to call me a "slacker" when I was younger, but I don't really know what that word means!
A slacker is a person who always avoids doing their work or lacks the attitude to do it. 
That doesn't sound like me at! Slacker is a strange word, I wonder where it came from?
Back during WW1, a slacker described someone not participating in the continuous war effort, or avoided the military service altogether