A stabbing action at a person who offended you or made a poor excuse for their absence. After stabbing them you can forgive them.
On the night of John's stag do his mate called up and said "sorry i can't make it". Stab@him, but forgive him. Stab-and-forgive.
On the night of a Huge engagement party so and so did not turn up, because of spam email apparently. Stab-and-forgive.
See also: stab@thee.