Apparently made from the tears of Cure singer Robert Smith, Goth juice is an item found on cult comedy show the Mighty Boosh. It has also recently been made into a real hair product produced by smelly store Lush.
"Ruth, how the hell did yo get your hair so fly, gurrl?" asked her mother.
"I used Goth Juice. It's brilliant mum!"
(shakes head) "Yo I don't wanna know. What the fuck Goth juice what yo gon be tellin' me next? That you squeezed one those sad kids I see in town an' yo made a body cream?"