The closest word this reminds me of is čigava...Which means whose. Otherwise I don't think it would mean anything else.

Najlepša hvala za razlago, Nelly.

Yes, you're right! It's also possible in other gender forms, therefore : "čigava" - female, "čigav" - male, "čigavo" - neuter. Also, I some people do say it as "čegavo", "čegav", "čegava", so it's not really necessary you misheard it.