jab shield

Is what you say when someone either within a defined perimeter, or smell-shot radius of you, farts. If you are the farter, you must pass the fart by tapping (or hitting) someone, and then shouting jab shield, which prevents it from being passed back. If someone smells your fart they can shout jabshield before you have decided to even pass it, thereby alerting others to the fart. The objective is to not be the person stuck with the fart.

Bill: {fart}
Bill hits Bob
Bill: Jab shield!
Bob: Doh!
Ben: Jab shield!
Bryan: Jab shield!
Bob hits Bernard
Bob: Jabshield!
Bernard: Dammit!

Bernard is stuck with the fart.