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1.
1.Someone who waits till the last moment to do anything.
2.A procrastinator.
3.From the word crash(to sleep) someone who is too lazy to go home when it's late, and sleeps wherever he is.
Paul: At this time yesterday John had nothing prepared for the presentation but he still gave a wonderful presentation this morning.

Anne: Yeah, John's a crasher.
by tosinfreeman August 27, 2007
 
2.
1. A rebel with a cause, especially an anti-authoritarian cause

2. An activist with the Bureaucrash Foundation.
1. He's a real crasher when it comes to defacing parking meters.

2. Did you hear about what the Crashers did in Cancun?
by Starchild September 18, 2003
 
3.
originally started in southern california, "crashers" is the name given to police officers that break-up (or crash) house parties.
matt: why is everyone leaving the party?
gilbert: the crashers are here.
by Los619 September 14, 2007
 
4.
originally started in southern california, "crashers" is the name given to police officers that break up (or crash) house parties.
matt: why is everyone leaving the party?
gilbert: the crashers are here.
by -=Los=- June 20, 2007