A aerial conflict where 2 to a unlimited amount of fighter planes are involved, the goal is to destroy the other fighter planes, usually to clear a way for bombers.
The History Channel use to have a series about dogfights, called "Dogfights", using computer design to remake dogfights, look it up on YouTube, great show.
The dogfighter Bud Anderson engaged in many dogfights in WW2 in his P-51 Mustang "The Crow", he was a triple ace with 16 confirmed kills.
In a nutshell, dogfooding means "using your own product". A product which is being dogfooded tends to be a lot more polished. When a normal user is annoyed by the product, they can't do anything about it. But when a developer is annoyed by the product, they can stop what they are doing and make the product less annoying.
In the past I'vealways dogfooded new builds for a while before making them
release candidates.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.