Learn English – What does “as in” mean? and how do you use this

The expression being used is wave off, not waive off.

This website from the Indianapolis Speedway explains it quite well:

Wave off – The process by which a team forfeits a qualification attempt. A driver or team can “wave off” an attempt any time before the start of the fourth and final lap in the attempt. If the run is waved off before the car takes the green flag, it does not count as one of the three allowed attempts for that car. Once the green flag is waved to start the attempt, the run counts as one attempt, even if it’s waved off.

If the context isn't auto racing (I assume it's not—what are live slugs doing in an auto race?), it's borrowed from auto racing, and has the same meaning.

At its origin, "self-deliverance" was mainly used in a religious context, when you "pray yourself out of" (sins, addiction, fear, ...), as a form of spiritual warfare.
To illustrate that, see deliverance-music.org, which has some detailed explanations on self-deliverance, as well as some "deliverance musics".

But dictionary.com refers to it as just one word:

"suicide", origin:1990-1995.

And that comes from the book "Final Exit: The Practicalities of Self-Deliverance and Assisted Suicide for the Dying".

The book covers many aspects of planning and carrying out "self-deliverance", from the decision of whether and when one is ready to die, to the careful protection of anyone assisting one's preparations, to the legal and financial preparations for those one leaves behind.

So that expression might have a grimmer meaning today that it had before 1990.