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
Get the mug
Get a seized mug for your cousin Callisto.
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
Get the mug
Get a Seized mug for your guy Georges.