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Yomi
zuttomo
Rōmaji
ずっとも
Type
slang
Meaning
BFF (best friends forever)
Synonym
親友, マブダチ, ニコイチ
Antonym
よっ友
Additional Info
It used to be often used by teenage girls, but now it sounds a bit outdated. These days, “BFF” (borrowed from English) seems to be more commonly used among them.
Example
うちら、ズッ友だよ!
We are BFFs!