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1.
A gatecrasher is a person or people the come to somebody's party unannounced and walk/force their way in, alot of the time if in a large group trash the persons home and steal things.
 
'Gatecrasher' though is also one of the best raves of all time with wicked laser shows.
"Yo, wanna go gatecrash that rich kids party?"
"Yeh, fo sho, we can steal us some bling bling while we there!"
 
"How good was gatecrasher man? It was way better than last years one"
"One of those lasers got me in the eye man, I can't see shit!"
by Matt[O] September 10, 2005
 
2.
Gatecrasher One is a trance club in Sheffield, England that was born after Gatecrasher toured the country, eventually settling at what was called "The Republic" in Sheffield. Although originally a trance club, it has bowed to the mainstream and now plays cheesey shite on a Thursday that pisses trance fans of the club off a treat.

Gatecrasher Two, the second of the chain of clubs opening is born in Leeds.

Often just called "Crasher."
Hey did you go to Gatecrasher One on Tuesday? It was Nu-Crasher, the only real night that plays the music that made Gatecrasher famous.
by Becks, October 28, 2005
 
3.
A broke ass hippie who will rush the gates of a concert with a large group of people in hopes of rushing by security and making it into the show. Only about 40% of a gate rushing crowd will actually make it into the show free, while the other 60% are either arrested or kicked out of the show. Sometimes hundreds of people will all rush the gates at once into the show, usually resulting in following shows on the tour getting cancelled.
Before Jerry died in '95, gate crashers had what would become one of the Grateful Deads last shows ever cancelled after they broke down the fence surrounding the concert, and hundreds of gate rushers made it by without getting caught.
by Corporal Clegg July 08, 2006
 
4.
A High-Tech tactical weapon invented in England. It is displayed on the television show "Future Weapons".
*Boom!*

Guy 1: What was that?

Guy 2: The Gate Crasher.
by Commander Clark October 01, 2009