Metallica is an American heavy metal band. It's the favorite band of MisterInfo.
Metallica is one of the things considered trash by the Deprimus Group because it sings a subgenre of heavy metal music called thrash, being often joked that it is trash because of the spelling similarities.
Example usage:
Because of Metallica singing thrash music that has similar spelling to trash, a meme with Deprimus was made where he looks at something that's trash and says "aoleu".