I found this on a meme, where this was the thumbnail, and when you clicked on the video, EVERY FCKING HOT DAY by Sr Pelo played (i.e. this video https://www.instagram.com/p/BRZ0IPYhelY/?taken-by=dankusofthememeus_v2)
>>15670565
It's a Gravity Falls/MLP crossover comic by shadowfenrirart
Here's the pic
>>15670599
Thank you very much