it’s code number for love live! school idol project’s nico yazawa’s catchphrase.
in j-panese, you pr-nounce 2 as ‘ni’ and the 5 just represents ‘co’ so if you read it in the code word, it would be

2 ni
5 co
2 ni
5 co

2 ni

love live fan #1: nico nico nii~
friend: stop with the nico nico nii’s. they’re getting really annoying.

love live fan #1: 25252
friend: i have no idea what you’re saying but it’s less annoying than those nico nico nii’s so that’s fine.

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