A really fat girlfriend that is often dated by men of small stature
Guy 1: Hey hows your new girlfriend?
Guy 2: My Lumpy Space Princess? Really good. I just had to calm her down the other night with breadsticks from Olive Garden.
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).