An Australian/New Zealand slang to congratulate someone on doing a good job or contributing something positive to those around them. Commonly used by individuals with roots in the Pacific Islands who have a real chilled out and laidback culture.
Example1:
Man 1: I went to Star Casino the other night and cleared $4000 on roulette.
Man 2: Ohh shot dox!
Example 2:
Rugby forward: *pulls off a massive hit in rugby*
Team mate: OHHH SHOT DOX!