Green’s Dictionary of Slang

(US campus) of a woman, to feel irritable, anxious.

1991		Eble Campus Sl. Fall.
1996		Eble Sl. and Sociability 37: Two kinds of shortening reduce words to letters. The dominant type in college slang is initialism, which names the individual letters: [...] PMS (premenstrual syndrome or putting up with men’s shit) ‘feel annoyed’.