“Pai se” is the Hokkien（闽南语） word of 歹勢,which means quite similar to 不好意思
just FYI

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Note added at 1 hr (2006-09-26 04:33:22 GMT)
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嘿嘿

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Note added at 1 hr (2006-09-26 04:33:53 GMT)
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also , somebody spell it like "pei sei"

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Note added at 1 hr (2006-09-26 04:36:06 GMT)
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Pai sei, :) u want the English?
I am sorry, I am embarrassed, you are so kind, whatsoever


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Note added at 2 hrs (2006-09-26 04:41:49 GMT)
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sometimes , u could just say"thank u " or "i feel indebted" for this"pai sei"