Procasterbating refers to putting off productive tasks in favor of masturbation. This slang term combines the terms "procrastination" and "masturbation." The term first appeared in Urban Dictionary in 2005.
The urge to masturbate comes naturally for many people, and is an activity that people use to combat loneliness, boredom and stress. Masturbating only becomes procasterbating when the costs outweigh the benefits. Even so, a little stress relief could be argued to improve productivity!