Having checked with multiple travel agent staff, and multiple airline staff from multiple airlines, across multiple continents, not a single one of them had ever heard of this term.
Every one of them initially stated that was I was referring to was called a “Double Open Jaw”, but once I stated that this was not what was being referred to (based on the OP’s comments), they were at a loss to explain what it was.
Also, Google’ing for this term returns nothing interesting (except for this very question on StackExchange!) which would simply not be the case for such a term if it was a valid industry term (to give some context, “double open jaw” returns over 15,000 results)
Based on this I’d be very confident in stating that this is NOT a standard industry term. I would suspect that one of two things is the case, either :
It is same term for double open jaw ticket. You go A -> B, returning C -> D.
Credit:stackoverflow.com‘