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1.
can be used in replace of some words such as "shit" and "fuck" or anything else after something dumb has occured to oneself
Dude 1: 2+2=5
dude 2: it totally equals 4
dude 1: CRAST!
by poop April 09, 2005
 
2.
A distraction or collection of distractions that keep one from achieving an intended task.

A population 'crastinates' or has 'crastinated' when a majority of their time is spent engaging in activities not even remotely productive.

When a population favors their 'crastinated' state of mindless entertainment with little or no interaction required over a properly functioning society, they are said to be 'Pro-crastination'
Sites like Youtube and Urban Dictionary are just the type of crast on the Internet today that really epitomize my stance on procrastination.
by Mars Redwyne October 29, 2008
 
3.
Abosultly Nothing at all.
Person 1 : Hey what's that you have behind your back?

Person 2 : CRAST!
by BobMcVicBob February 18, 2008
 
4.
One of the most badass motherfuckers to ever live on this planet!
I can't believe you haven't met crast!
by osuhunkybabe November 23, 2008