He's that guy you see in every team fortress 2 comment section as one of the top comments in the comment sections of youtube, he also may appear in comment sections you would never expect him to be either.
A period of time during a school year when academic responsibilities are pushed aside in favor of non-academic pursuits. In slacker terms, an entire semester of going to the bar every night instead of studying. See also, alcoholism.
While it may happen at any point in a college, graduate, or high school career, typically a slackmester occurs in the last semester of a given school period, when students suddenly realize how pointless hard work really is.
To engage in an intense exercise or fitness regime which causes one to ignore relationships and responsibilities; usually a short-lived affair seen at the beginning of the year and immediately prior to bikini season.
Jessica: "Sorry I didn't call you back. I was on the treadmill. I love the way I feel now that I'm losing weight!"
Martin: "Well, I swear to God, if you don't answer the phone again because you're stairmasterbating I'm going to come over and poke Rocky Road down your throat."