1. Someone who is always in a bitchy mood and/or PMSing.
Sam: "My mom is always pissin' me off and bitchin' me out."

Gage: "Dude, she's a perma-bitch."
by GageT90 June 1, 2009
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Most women express 'resting bitch face' in certain situations. Some women always have a bitch face. Hence, perma(permanent) bitch face.
'That lady Wendy always looks pissed off & angry.' "Yea, she suffers from perma bitch face."
by Industrialistdoitbest February 9, 2017
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