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It's basically like "pwnd" or "owned". Yell it when someone trips down a flight of stairs, or something.

Alledgedly from Halo.
Primus: *falls down stairs*
Secunda: Seized, asshole!

Primus: *is pushed down stairs by Secunda*
Secunda: Managed to seize ya!
by PJtheHatter September 10, 2006
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3
When your entire life is taken away from you in the blink of an eye.
Just weeks after his 14th birthday, he was seized by a massive stroke. His parents didn't know what to do without him.
by Overdrive2005 October 26, 2014
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