At first taste, it reminds me a bit of bumbleberry pie — tart, and definitely berry-y, but not necessarily one particular berry. I’d definitely say that there’s raspberry in there, but it’s clear that it’s not alone.
Cooling down, it appears to be far more tangy than actually fruity. It would be nice to have more sweetness to balance the tang and bring out the fruit, but at least I suppose it is very much living to its “zinger” name.