Urban Dictionary: acronym
Australian Idiom 1. Used to signify the feeling one experiences at the pinnacle of relaxation. 2. A command given to assist one in relaxing "Socks off mate!" Bazza said to Johno after opening a fresh beer. Johno turns to Bazza affirmingly and replies "Socks off!"
https://www.urbandictionary.com/define.php?term=acronym