expression
definitely OK; definitely possible
Slang expression used to strongly affirm that something is acceptable, feasible, or a good option. Often used in casual conversation or online comments.
See also: 在り
このプラン、ありよりのありだと思う。
I think this plan is definitely a go.
A: 明日カラオケ行かない？ B: ありよりのあり！
A: Wanna go to karaoke tomorrow? B: Absolutely!
なし means 'not OK' or 'impossible'; the opposite of あり.
A slang phrase built from あり (OK/possible) + 寄り (leaning toward) + の + あり, literally 'an OK that leans toward OK', emphasizing strong affirmation. The exact origin is uncertain but it likely emerged from casual youth speech or internet culture.