The period at the end of the month when police act like bastards and give more tickets to fill their quotas. If you come across a female in this situation, you're totally fucked.
Dan: "Dude I'm drivin to Florida tomorrow."
Tim: "Ya well watch out for cops with PMS, it's the 31st."
Tim: "Ya well watch out for cops with PMS, it's the 31st."
by Willy March 21, 2005