One who will do anything, including spending an entire day looking up random words on urban dictionary, to get out of doing work. This habit often has a terrible effect on that person's relationships, work, or grades.

A swimmer

A person who waits until the last possible minute to complete a task. A model of efficiency.

If you wait until the last minute, then it only takes a minute to do it.

One who, when advised that today is the first day of the rest of his life, replies, no, that's tomorrow.

Someone who delaying or postponing something.

A pro crastinator is someone who takes procrastination to the next level.

The pro crastinator's motto is "Why put off something until tomorrow that I can put off until the day after tomorrow?"

As defined by Gumball Watterson,

"Derived from the Mexican word "procratamaleithion" which means midnight snack, and the Viking word "Assinator" which means puckered cheeks.
It describes a person who sits on a sandwich in the dark."