“What's the meaning of this ...?” in Japanese
Short answer
What's the meaning of this ...? in Japanese is “何事” (nanigoto). Full meaning: what, what sort of thing; everything, anything; what (on earth)?, what's the meaning of this ...?, what's this ... all about?.
Other ways to say “What's the meaning of this ...?” in Japanese
何ごと
nanigoto what, what sort of thing; everything, anything; what (on earth)?, what's the meaning of this ...?, what's this ... all about?
なにごと
nanigoto what, what sort of thing; everything, anything; what (on earth)?, what's the meaning of this ...?, what's this ... all about?
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