This is an Indian - South African word for describing a mini party, this likely happens when you go out one night and land up partying it up unexpectedly. Must commonly known as it's abbreviation "CJ".
Example 1:
Dude 1: "Eeey men, what kind? You keen for a CJ?"
Dude 2: "What do you mean man?"
Dude 1: "Lets head to the strip club for a drink or 2."
Example 2:
"Wow that was a massive catan jalang last night. We landed up drinking a whole 4 pack of beers then proceeded to chug them down with shots of jaagermeister."