Storm-a-brewin 

The phrase used by a girl to warn someone of her impending PMS.

Oh shit, I can feel a storm-a-brewin down south. This isn't going to be pleasant.

Storm-a-brewin by Deadinlivingform October 9, 2011

storm a-brewin' 

When gusty winds and random tumbleweeds swiftly roll by your feet, you know its time for a mortifying storm!

Hey Megan, did you hear on the news that there's a storm a-brewin'?

storm a-brewin' by John Valencia May 28, 2006

storm a-brewin' 

the time between eating and having terrible, almost lethal gas

After his eighth bowl of chili with extra mayonaise, Jack knew that there was a storm a-brewin', something that Gartek, PstaKng, Stiltz, and Papa would not be looking forward to. In fact, he was too rude girl. 2-rood.

storm a-brewin' by Stiltzkin December 19, 2003