...
While "My Name is Brian" song is composed of English words, they are strung together into sentences that are untranslatable and cannot be used for real communication.
https://plus.thairath.co.th/topic/subculture/105713
https://themomentum.co/ent-my-name-is-brian-joke-iscream/
Both the name of the song and its lyrics are gibberish, but are intended to represent what American English sounds like to people who do not understand English.
The song is intended to sound as if it is sung in English spoken with an American accent; however, the lyrics are deliberately unintelligible gibberish.