it's a gundam! 

A phrase commonly said after seeing said gigantic robot, which, when uttered, will inexplicably trigger a gigantic explosion to consume you or many of your comrades. It is entirely possible that said mecha would be unable to fight if a nameless enemy soldier didn't shout this first.

Nameless soldier: "IT'S A GUNDAM!"
*Arm explodes for no apparent reason*
"HE'S GOOD!"

it's a gundam! by AFK47 May 20, 2006

Oh no it's a gundam 

This phrase is often used in the Gundam Anime series. A typical grunt will point out the window of his mech and say "Oh no it's a gundam!" and then shortly blow up as a result.

This phrase indicates the massive power of a "Gundam".

"Oh no it's a Gundam!" * BOOOM *

Another acceptible version...

"Oh no it is a Gundam!" * BOOOM *

Oh no it's a gundam by LiquidZ November 2, 2005

It's a Gundamn!

A well known catch phrase used by deceased Mobile Suit pilots from the Gundam anime series.

"IT'S A GUNDAMN!"
*is cut in half by Wing Zero*

It's a Gundamn! by theurbansamurai January 26, 2005