Badger badger mushroom refers to a flash-animated music video clip from the early 2000s.
The clip features a bunch of badgers dancing to an electronic beat, in looped sequences. A mushroom also appears a few times by the end of each sequence.
The clip originates form the flash-sharing website Newgrounds. It was an indefinite loop that was uploaded in 2003.
Badger badger mushroom was uploaded by a user called TheWeebl, who was also a famous content creator on YouTube under the name Weebl’s stuff.
On Newgrounds, the clip of badger badger mushroom was an endless loop, but minute-long versions were also uploaded on YouTube both by the owner of the content and third-party personnel in 2003.
It was a very popular meme, and so a lot of video parodies were created on YouTube during the following years.