It is a simple procedure that sometimes initiates labour, reducing the risk of babies being born over the due date (42 weeks of pregnancy). A fist and twist releases hormones which prepares the cervix for birth and sometimes initiates labour.
Adj was booked in for a second fist and twist after the Dr's first outing had not satisfied her.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).