What sound is it? Does it duplicate an Arabic sound or something? Neither of us has ever encountered it before.
(PS - Apologies if the chupchik is on the wrong side--MacOS doesn't correctly transfer it to the left unless another letter follows, so I put it in LTR. My luck it will display in reverse in Windows or something! It should, of course, be chet-chupchik.)
ETA: Found it on Wikipedia - although there appears to be some confusion about whether it's the uvular or velar fricative!