Experienced this yesterday. The offending juice would be 'slush puppy' by 'suck and blow'.
Words can't really describe accurately just how foul this tasted to me but if I was forced to I would say it's how I would expect vaping on rotten meat to taste. I only put about 6 drops of the stuff onto my coil at about 8pm last night & I could still taste it at lunchtime today. This was even after vaping 7ml of 'jack frost' (strong tasting blackjack flavour).
It's got to be Dragonscape by NJoy. If it didn't have the bourbon undertones it probably wouldn't be that bad as far as coffee flavours go. With it however, it is vile.
Not tried anything really bad tbh there was a 30ml of some coffee choc thing i bought for discount 3quid when vapescape was closing. not good at all and i love coffee but just wouldn't puff it. Cant remem what it was called.
Ultimately it was one of my own i found truly vile, i somehow thought it was a good idea to mix Buckfast with VG at "20% flavour" well when dripped that onto my RDA i literally nearly spewed for the next half hour.
and yes id had a bottle and many cans at the time Dunno why i thought that was a good idea..
Strawberries and Cream, can't remember the maker but it smelt great in the bottle however the vape was like week old milk that had been left in the sun