It was first discovered in 1968 and popularised by the famous singer, Cat Stevens (now known as Yusuf Islam), in his song 'Banapple Gas'
It is classified as a class-A drug
(sprays police man)
Police Man: hahahahahahahahahahahahahahahahahahaha
Banapple can also be used as a adjective or adverb describing a thing or person in seriously douchy way.
Boss: "You have to was all those dishes before leaving."
Employee: "This job is fucking banapple..."