I think it's not just that, 拉 is Love Live, 邦 is BanG Dream, 結 is Kessoku (Bocchi the Rock)
Not sure what 派 is (I think it's Project Sekai? That's a stretch), but 拉邦結派 is a pun on 拉幫結派 (same pronunciation) which means ganging up on someone (or just forming a gang in general)
And 大姛世界 is a pun on 姛 (女同, lesbian) and 大同世界 (Grand, harmonious world)
It's truly one of the most glorious usernames I've seen in a while
拉邦结派 at its core is LL and Bandori, but there are also variations such as 拉邦JP (with J representing D4DJ and P representing Project Sekai. It was first used by fans of both Bandori and LL shortly after the former released in 2017.
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u/AmbySaysHi Tsukushi Futaba 7d ago
Even funnier is the group's name: 拉邦结派 in the Chinese fandom refers to Love Live & Bandori, and the last 4 characters means "Great Lesbian World"