https://www.scuba-diving-smiles.com/the-meaning-of-bwarf-on-a-predive-checklist.html

The Meaning of BWARF on a Pre-dive Checklist

BWARF is actually a PADI acronym for a final pre-dive check. I was certified by NAUI so I don't use this one but all checklists basically cover the same fundamentals.

BWARF is the acronym used by PADI to remind divers of all the things they need to check before they enter the water. It's alway good to check for yourself as well as your buddy.

B stands for BCD/buoyancy: check that everything is connected (buckles, air inflator
hose, etc.). Make sure the dump valves are working, the BC holds air (no leaks/tears) and the tank is securely fastened.

W stands for weights: make sure the weight belts are on or are secure in their pockets
if you have an air integrated BC. Also check that weight belts are set for right hand releases.

A stands for Air: double check your air (and your buddys) is on. Check how much pressure is in the tank. Check the air to both the primary regulator and octopus.

R stands for Releases: check the releases (BCD, tank strap, attached equipment, etc.) - where they are, how they come undone and are they properly buckled before the dive. You need to be aware of how it works for your buddy in case of an emergency.

F stands for Final OK: Do a final head to toe check. Are the mask and fins on, does anything not look right on your buddy?

There are also some acronyms people use to make remembering the checklist easier. Two of the more popular ones are:

Burger
With
Relish
And
Fries

Big
White
Rabbits
Are
Fluffy

As you can imagine, there are alot more running around but those are two of the safest.

PADI's version is:
Begin
With
Review
And
Friend