When a person (male or female) inserts four fingers into a female's vagina when they are on their period
friend 1: my girlfriend wanted to spice up our relationship, so i gave her the Deepin' Jamjar.
friend 2: wow! sounds fun, i'll try that with my girlfriend tonight.
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).