A last-minute cancellation.
Specifically bailing right at the end, not cancelling in good time. Used as a verb with する. Carries real social weight in a culture where plans are firm, so it is a genuine complaint, not a shrug.
From 土壇場 (dotanba, the final moment — once the execution ground) plus キャンセル, cancel.
An accusation. Saying someone did a ドタキャン is calling them unreliable.
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