To be belligerently up at arms, ready or eager to fight, violently protective.
This expression originates from the southern United States where it is common for houses to have porches. To be "off the porch" means to be in your yard and looking for a fight with any and all tresspassers.
We off the porch ... that means if you walk in our yard, we gon' beat yo ass so bad yo momma won't recognize ya.
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