multiple accounts; alt accounts
Internet slang for having or using more than one account on social media, games, or online services. Often used in contexts like 複垢禁止 (no multiple accounts allowed) or 複垢持ち (someone who has multiple accounts).
Multiple accounts are prohibited in this game.
He uses different alt accounts on Twitter.
Common internet slang spelling using ateji for 垢 (アカ).
Alternative spelling using katakana アカ; also common in online contexts.
Abbreviation of 複数アカウント (multiple accounts). 垢 is ateji for アカ, which is a common internet slang shortening of アカウント (account).