Words uttered to incite an all in brawl. Whoever says the words 'Crab Battle' will usually be spear tackled to the ground by anyone else present, and all parties will then engage in a fight to the death.
Steve: "hey did you see that new movie that came out-"
John: "CRAB BATTLE!!!"
An event or circumstance set to take place in the future which, if attended/experienced, can be predicted to produce catastrophic results for the individual expressing the term, including but not limited to serious injury and/or death.
a sheet of paper that has the words "Crab battle" written on it. Also may have a smiley on it. Used to commemorate an occasion usually at a random time.