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Explanation: I'm not sure if I'm correct or not, but you may be extracting an onomatopoeia which signifies the sound of someone's hitting someone else or something. So, if that's the case, it would be all in all "Poka!". Sorry, I don't know guess more.
Explanation: Dear Mr./Ms. Kinta
pokai: I have the feeling there is no such word.
Any possible meaning now depends on the context.
IF you are dealing with technical texts, industrial manufacturing etc., Japanese engineers have the habit of calling defective parts = rejects "poka" and their removal from a manufacturing process would be "poka yoke" - something not listed in dictionaries.
If you are NOT dealing with technical text, the other provided answer may be preferrable.