Japanese insult, used by English weebs and degenerates. Kuso = shit and gaki = kid, so "kusogaki" is something similar to "spoiled brat" or "little shit" in English.
Subaru: Nene, you are being charged with being a KUSOGAKI! It says here you used the mysterious phrase poopeepee~
Coco: My cousin came to Japan recently. Last time I saw him he was just a baby, but he turned into a real KUSOGAKI now! He has such a bossy face, I'm shocked.
Coco: My cousin came to Japan recently. Last time I saw him he was just a baby, but he turned into a real KUSOGAKI now! He has such a bossy face, I'm shocked.
by absolutely_not_a_weeb April 4, 2021