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1.
(v.) To slack off by wasting time idely, sometimes through electronic means like video games, or through alcohol, doing absolutely nothing, or sleeping excessively. To goof off is to pass the time through the most unproductive means possible.
I completely goofed off in college, devoting my life to slime volleyball, Soul Calibur 3, and ultimate frisbee instead of academics. Now I'm a level 3 barbarian living in a shack by a tucked away creek in Intercourse, Pennsylvania. It was totally worth it.

I totally goofed off. It's three in the morning and I'm still reading hysterical defs on urbandictionary.com.

To goof off is to live life to the fullest.
by papermachete October 30, 2005
 
2.
1. To slack off or waste time with the implication that the time is better spent at something to hand (like one's job);

2. Semi-euphemism for "masturbate."

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-After school, Sam was downtown as usual, the typical small-town Drugstore Cowboy, goofing off.

-In the movie THE LAST PICTURE SHOW (1971), the coach's remark to the basketball team, "If y'all boys didn't jack off so much, you might amount to something," was replaced by "If y'all boys didn't goof off so much, you might amount to something," for the TV release.

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by al-in-chgo August 18, 2010
 
3.
to leave a crowd to find a hidden place and masturbate. especially at work.
Instead of dealing with customers, alex goes away to goof off.

"If you ever want to find a good place to goof off, ask joaquen."

George goofs off to pictures of his friends. what a perv.

Goofing off is not cool, and should only be done in privacy.
by schememaster April 23, 2008