HI Jack!
"रुक जा रे" means, if you are saying to someone "Hay! Stop".
Other one "अत जा रे" ( I think it can be) "अब जा रे", It means " Now you go"
"जा रे जा रे" means "JUST GO!!"
These words are like slang's because when you will be in that environment you will understand the real meaning. India is a country of various languages and mixture of area wise languages.
Thanks