What is this curious acronym?
RDWHAHB means: Relax Don't Worry Have A Home Brew.
Coined many years ago by the "Godfather" of homebrewing, Charlie Papazian.
This phrase has even populated urban culture: Urban Dictionary
Find about more about this at the American Homebrewers Association Website.
Get yourself a bumpersticker.
Acronym Definition RDWHAHB Relax, Don't Worry, Have A Homebrew