when you make a "lady" cum and her leg is twitching, or shaking very rapidly. this also includes eyes rolling into back of head.
me: hey bob.
bob: whats up?
me: i had this lady over my house last night. we did our thing, and like usual i gave it to her so good she did the lady-twinge
. yes she came very hard!
bob: wow! can you teach me how to do that?