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1.
The greatest cry ever shouted in the history of the universe, only to be shouted directly before delivering a kick to the sternum over a large, seemingly endless pit that has no logical reason for being there but looks really, really, awesome.
This is blasphemy! THIS IS MADNESS!!! Madness huh? THIS IS SPARTA!!!!!!!
by Luc F June 02, 2007
 
2.
A statement that, when said, causes you to win a quarrel regardless of how irrational your reasoning is.
Me: "Ok, all bad people start out as babies, right? If our society adopted the idea of regularly eating babies, then there would be no bad people!"
Sarah: "Your fucking insa..(i interrupt)"
Me: "This is Sparta!"
Sarah: "Damn it..."
by Dylan B. May 27, 2007
 
3.
A phrase used prior to an ejaculation.
guy: I'm coming baby!

girl: no wait!

guy: THIS IS SPARTA!!!
by lolz00000000000001 June 07, 2009
 
4.
Internet meme taken from the movie 300
Guy 1:"This meme sucks"
Guy 2:"meme?
THIS IS SPARTA!"
by Ankh March 03, 2007
 
5.
Used by Spartans to demonstrate to Persian messengers the first, second, and third laws of motion. Upon kicking the messenger over the ledge, the messenger exerted an equal force back upon the Spartan. At the same time, gravity accelerated him down the seemingly endless hole, and he will continue moving with a high velocity until he encounters the ground and transfers momentum to the ground, equal to his acceleration times his mass.

In reality, the phrase is simply one of the most awesome phrases ever uttered before.

Used in forums or gaming to signify ownage.
You're playing call of duty 4 and kill four people at once with a .50 caliber sniper rifle.

You: "THIS IS SPARTA!!!"

Others: *running away*

You're on a forum and a noob is spamming.

You "THIS IS SPARTA!!!"

Noob: "Aaaaahhhh........*whump*"

Noob gets banned.
by Someguyfromcrowd September 18, 2009
 
6.
the single greatest battle cry in existance. Every time it is heard it brings an un-conditional tear to one's eye. It was spoken by leonidas prior to kicking a messanger in the chest in order to send him sprawling into a well.
1-"This is madness..."
2-"Madness? THIS IS SPARTA!"
2-*proceed to kick into huge and conveniently placed well*
by that guy..................,... March 14, 2010
 
7.
The best line in the whole universe. Use it when you are going to deliver a finishing move on somebody you completely hate.
Class Bully- Take this, you stupid Star Trek nerd!
Nerd- Please, no!
You- I hate him more than you do. (you kick the nerd)
Nerd starts crying
You about to give him a broken rib- THIS IS SPARTA!!
the nerd goes through the floor and into the worst school lunches ever.
by Junkyard Squirrel July 28, 2010