I tried to find out but I found that '痞' means constipation which I think would be highly unlikely in cases like this:
'痞痞的小小姐' or '痞痞的小家伙'
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Sign up to join this community痞 means bad, eg, 痞子 is like the English word "rogue". I have seldom seen the phrase "痞痞的", but i think it would mean somebody is naughty, like a scamp maybe.