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キャパ kyapa
My personal bandwidth.
What does kyapa mean?
From capacity. Not your schedule but your mental limit — キャパオーバー is the moment your brain declines any further input.
Example
同時に三つは、もうキャパ超えてる。
Three things at once is already past my limit.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind kyapa
In the live music business キャパ means something boringly concrete: how many bodies a venue holds. A small club is キャパ200. At some point the word walked out of the venue and into people's heads, where it now measures how much a person can take before something spills.
キャパオーバー, capacity over, is homemade English. It has become the blameless way to decline: not I do not want to, but my capacity is exceeded — a mechanical fact, like a lift's weight limit. In a working culture that finds a flat refusal awkward, having a technical-sounding word for your own ceiling turns out to be genuinely useful.