Brbr Deng is a nickname given to the 2000 song "Dig" by American heavy metal band Mudvayne. Starting in 2012, the song has appeared in humorous edits on YouTube and other platforms, acquiring the onomatopoeic nickname "Brbr Deng" in late 2018
Person 1: “Hey, you know that song that goes brbr deng?”
Abbreviation for Wubba Lubba Dub Dub, which is Rick's catchphrase in the show Rick and Morty. Birdperson also reveals that it means “I am in great pain, please help me” in his native language.