DAW= Digital Audio Workstation. A term usually used to describe a PC or a Macintosh Computer that is used primarily for Music Creation and Recording, Mixing, and Mastering Audio Files. Found is many Home studios as well as Professional Recording Facilities.

A term used to reference cannabis/marijuana/weed.

It's like saying "aw", only you start out with your mouth closed, so it comes out as "d'aw". It's not commonly known, but it is commonly said. Nor is it a proper contraction, but something said unconsciously.

the dirty south tweakers version of a true friend

Derived from egyptian slang, Daw is a word used to describe Homosexuals who are also obese. The word comes from the word Circle in Arabic but was shortened to fit into sentences easily.

"Don't ask why, just make a mental note and move on."

It's always best to "Don't ask why, just make a mental note and move on." If you start asking why then your just asking for trouble.