If a person has acted in a appalling/unforgivable manner, the offended party will leave all their belongs on the porch of the house they are currently residing in and locked out...forever.
Also could be used as an idle threat, but should not be taken lightly.
I cant believe she acted that way, right shes getting porched!
I cant believe I got porched!
Dont make me angry, you may get porched!!!