@odd Ha! Moonshine is probably a universal constant anywhere there’s a countryside, but I’d never heard it called “bug juice” before finding this wiki entry. The bug juice that I knew as a kid in the US was the first definition (though I’ve occasionally heard bug spray referred to that way).
The term has two competing and equally plausible (as confirmed by my own personal experience) etymologies. First: that the high sugar-content of the juice draws summer insects (especially gnats) to drown themselves in it, so that any plastic cup or jug of the stuff will soon have at least a few dead bugs floating in it. Second: the high sugar-content causes any children who drink it to flit around like bugs. //@smokey