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One who waits until the very last second to do anything, but still gets it done. One who will do anything and everything he/she can to put off work, including writing definitions into the Urban Dictionary. One who procrastinates in every aspect in his or her life.

"What do you do for a living?"
"Well, I'm a Professional Crastinator"
"What's that?"
"Hold on, I'll tell you in a minute."
by Burtrum May 13, 2008
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A person who can waste as much time as humanly possible, as effectively as possible, while still attaining above average grades in school/working adequately.

Different from procrastination due to the effectiveness, (i.e. rather than twiddling your thumbs you prepare to be as comfortable as possible for as long as possible, and due to the result, where you still perform adequately enough to make a living and have it not affect you financially/educationally.
"How the fuck does that guy get such good marks, he just sits in his room browsing memes and masturbating for hours on end!"
"He's a Professional Crastinator, BRENDA, you uneducated capitalist fuck. Of course he can waste that much time and somehow make a living simultaneously"
by 765boo May 02, 2018
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