where a woman for some ungodly reason or caused by birth countrol, or pms just starts bitching.
I walked into the libray with a barrel of monkeys and she just insta-BITCHED all over the place.
An instant bitch. Calm, cool, cute, and collected at first, but say one wrong word and it's INSTA-BITCH!
-Geez Glyde, stop being such an insta-bitch.
-You. Shut up. And get out of my house!