Meaning
To hire a taxi (or bus) exclusively for yourself, rather than sharing it as a route 'robot' with other passengers — you pay for the whole vehicle to take you directly. 'Mi a charter di taxi' means you've booked it privately. As a noun, a 'charter' is such a private hire.
Examples
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Mi charter a taxi fi go straight home.
I hired a taxi privately to go straight home.
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It cost more fi charter dan fi tek robot.
It costs more to hire privately than to take a shared taxi.
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Dem charter a bus fi di outing.
They chartered a bus for the outing.
Origin
From English 'charter' (to hire exclusively); contrasted with the shared 'robot' route taxi. See [[route-taxi]], [[robot]].
How it’s used
To hire a taxi/bus privately (vs. shared 'robot'). See [[route-taxi]], [[robot]].