Call of Duty slang “sice”?

I have stumbled across the verb sice which is reported by these Urban Dictionary definitions to be used in playing Call of Duty:

Sice is like slice, except for it's sice. Often yelled while playing Call of Duty and using the melee attack to kill an opposing player.

To conduct a knife attack on an opponent or team mate while playing Call Of Duty.

Can anybody confirm these definitions? If they are legit, what part of Call of Duty does that word come from?

Solution 1:

Sice could be a combination of slice, i.e. a melee attack with a knife and the sound a knife makes when its pulled from its sheath.

Think of movies when someone pulls a sword out of sheath. What sound does it make? It sounds like "sice".