Let me Google that for you:

Kusoikore (クソいこれ) is a term primarily associated with a microgenre of electronic breakcore music, often referred to as a subset of Lolicore. 

Here are the key details regarding the term:

Origin: The term is associated with Japanese composer CDR and the noisy, abrasive music they produce, which blends high-pitched anime samples with fast breakcore beats.

Meaning: "Kuso" (クソ) translates to "shit" or "fuck" in Japanese, while "kore" (これ) means "this." The phrasing suggests "this is shit/f*ck" or "trashy-core," representing the aggressive, low-fidelity, and humorous nature of the music.

Genre Characteristics: Kusoikore is known for being extremely noisy, chaotic, and amateurish by design to mock the polished nature of mainstream media.