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 *
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