Infectiously-catchy earworm 'PPAP' (short for Pen-Pineapple-Apple-Pen) was performed by DJ Piko-Taro, a fictional character played by Japanese entertainer Kazuhiko Kosaka.
这首魔性洗脑神曲PPAP（全称为Pen-Pineapple-Apple-Pen）是由日本艺人Kazuhiko Kosaka扮演的虚构人物DJ Piko-Taro演唱的。
And it goes like this:
"I have a pen. I have an apple. Apple-pen!
I have a pen. I have [a] pineapple. Pineapple-pen!
Apple-pen. Pineapple-pen. Pen-Pineapple-Apple-Pen."
But how did the 40-year-old DJ come up with such a bizarre song about fusing a pen with an apple and a pineapple?
"When I was making this music with play, I was [just] singing it too soon," the newly-crowned internet star explained in a tweet to fans from an account created for his newly-coined character.
Why has it gone viral?
It has all the ingredients for a viral video formula: an addictive beat, silly lyrics and a hilariously simple dance routine to back it up.
And it was only a matter of time before the minute-long song, first uploaded onto Piko-Taro's official YouTube channel, quickly spread to Facebook.
While the original video has gone on to amass more than 4m views, entertainment portal 9GAG's Facebook video surpassed that to draw more than 44m views.
'I have a pen... I have an apple...'
"I'm ruined - I will never get this song out of my head," lamented Facebook user Carlos Andrés Silva in a comment.
Nelson Rivera Adrian Paige agreed, voicing concern for the number of times he has looped the video. "I am both highly amused as well as extremely confused."
Nelson Rivera Adrian Paige表示已经循环播放好多遍：“我觉得很好玩儿，又有点不明所以。”
"Please stop sharing this annoying song, it's exploded on my feed and is driving me up the wall because it's so irritating to listen to," said Facebook user Hiro Kenshida in a plea.