To conduct a knife attack on an opponent or team mate while playing Call Of Duty.
When your opponent dies from a knife attack you would scream "SICE" into the headset so you team mates would know.
Throwing knives are also sice-worthy.
"Yo guy, I'm about to sice the sniper camping at the top of the hill". as I walk over to his position, i maneuver my way behind him and then, "SICE" !!!
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